diff --git a/Translate/metadata/V3/TranslationService.php b/Translate/metadata/V3/TranslationService.php
index bc97c6130b8..f7615d188f3 100644
Binary files a/Translate/metadata/V3/TranslationService.php and b/Translate/metadata/V3/TranslationService.php differ
diff --git a/Translate/samples/V3/TranslationServiceClient/batch_translate_document.php b/Translate/samples/V3/TranslationServiceClient/batch_translate_document.php
index b17e436d30a..53ea4c08032 100644
--- a/Translate/samples/V3/TranslationServiceClient/batch_translate_document.php
+++ b/Translate/samples/V3/TranslationServiceClient/batch_translate_document.php
@@ -50,10 +50,10 @@
  *                                           the same location-id) can be used, otherwise an INVALID_ARGUMENT (400)
  *                                           error is returned. Please see
  *                                           {@see TranslationServiceClient::locationName()} for help formatting this field.
- * @param string $sourceLanguageCode         The BCP-47 language code of the input document if known, for
+ * @param string $sourceLanguageCode         The ISO-639 language code of the input document if known, for
  *                                           example, "en-US" or "sr-Latn". Supported language codes are listed in
- *                                           Language Support (https://cloud.google.com/translate/docs/languages).
- * @param string $targetLanguageCodesElement The BCP-47 language code to use for translation of the input
+ *                                           [Language Support](https://cloud.google.com/translate/docs/languages).
+ * @param string $targetLanguageCodesElement The ISO-639 language code to use for translation of the input
  *                                           document. Specify up to 10 language codes here.
  */
 function batch_translate_document_sample(
diff --git a/Translate/samples/V3/TranslationServiceClient/translate_document.php b/Translate/samples/V3/TranslationServiceClient/translate_document.php
index 9e4edd83703..ab9034650d9 100644
--- a/Translate/samples/V3/TranslationServiceClient/translate_document.php
+++ b/Translate/samples/V3/TranslationServiceClient/translate_document.php
@@ -43,7 +43,7 @@
  *
  *                                   Models and glossaries must be within the same region (have the same
  *                                   location-id), otherwise an INVALID_ARGUMENT (400) error is returned.
- * @param string $targetLanguageCode The BCP-47 language code to use for translation of the input
+ * @param string $targetLanguageCode The ISO-639 language code to use for translation of the input
  *                                   document, set to one of the language codes listed in Language Support.
  */
 function translate_document_sample(string $parent, string $targetLanguageCode): void
diff --git a/Translate/samples/V3/TranslationServiceClient/translate_text.php b/Translate/samples/V3/TranslationServiceClient/translate_text.php
index b4cd16bfd8e..960046525ae 100644
--- a/Translate/samples/V3/TranslationServiceClient/translate_text.php
+++ b/Translate/samples/V3/TranslationServiceClient/translate_text.php
@@ -31,10 +31,9 @@
  * Translates input text and returns translated text.
  *
  * @param string $contentsElement    The content of the input in string format.
- *                                   We recommend the total content be less than 30k codepoints. The max length
- *                                   of this field is 1024.
- *                                   Use BatchTranslateText for larger text.
- * @param string $targetLanguageCode The BCP-47 language code to use for translation of the input
+ *                                   We recommend the total content be less than 30,000 codepoints. The max
+ *                                   length of this field is 1024. Use BatchTranslateText for larger text.
+ * @param string $targetLanguageCode The ISO-639 language code to use for translation of the input
  *                                   text, set to one of the language codes listed in Language Support.
  * @param string $formattedParent    Project or location to make a call. Must refer to a caller's
  *                                   project.
diff --git a/Translate/src/V3/BatchDocumentOutputConfig.php b/Translate/src/V3/BatchDocumentOutputConfig.php
index ba84707c1ab..ae9cab5054d 100644
--- a/Translate/src/V3/BatchDocumentOutputConfig.php
+++ b/Translate/src/V3/BatchDocumentOutputConfig.php
@@ -50,7 +50,7 @@ class BatchDocumentOutputConfig extends \Google\Protobuf\Internal\Message
      *           Since index.csv will be keeping updated during the process, please make
      *           sure there is no custom retention policy applied on the output bucket
      *           that may avoid file updating.
-     *           (https://cloud.google.com/storage/docs/bucket-lock?hl=en#retention-policy)
+     *           (https://cloud.google.com/storage/docs/bucket-lock#retention-policy)
      *           The naming format of translation output files follows (for target
      *           language code [trg]): `translation_output`:
      *           gs://translation_output/a_b_c_[trg]_translation.[extension]
@@ -96,7 +96,7 @@ public function __construct($data = NULL) {
      * Since index.csv will be keeping updated during the process, please make
      * sure there is no custom retention policy applied on the output bucket
      * that may avoid file updating.
-     * (https://cloud.google.com/storage/docs/bucket-lock?hl=en#retention-policy)
+     * (https://cloud.google.com/storage/docs/bucket-lock#retention-policy)
      * The naming format of translation output files follows (for target
      * language code [trg]): `translation_output`:
      * gs://translation_output/a_b_c_[trg]_translation.[extension]
@@ -149,7 +149,7 @@ public function hasGcsDestination()
      * Since index.csv will be keeping updated during the process, please make
      * sure there is no custom retention policy applied on the output bucket
      * that may avoid file updating.
-     * (https://cloud.google.com/storage/docs/bucket-lock?hl=en#retention-policy)
+     * (https://cloud.google.com/storage/docs/bucket-lock#retention-policy)
      * The naming format of translation output files follows (for target
      * language code [trg]): `translation_output`:
      * gs://translation_output/a_b_c_[trg]_translation.[extension]
diff --git a/Translate/src/V3/BatchTranslateDocumentRequest.php b/Translate/src/V3/BatchTranslateDocumentRequest.php
index 5405b091a27..5c1d8d0c575 100644
--- a/Translate/src/V3/BatchTranslateDocumentRequest.php
+++ b/Translate/src/V3/BatchTranslateDocumentRequest.php
@@ -27,15 +27,15 @@ class BatchTranslateDocumentRequest extends \Google\Protobuf\Internal\Message
      */
     private $parent = '';
     /**
-     * Required. The BCP-47 language code of the input document if known, for
+     * Required. The ISO-639 language code of the input document if known, for
      * example, "en-US" or "sr-Latn". Supported language codes are listed in
-     * Language Support (https://cloud.google.com/translate/docs/languages).
+     * [Language Support](https://cloud.google.com/translate/docs/languages).
      *
      * Generated from protobuf field <code>string source_language_code = 2 [(.google.api.field_behavior) = REQUIRED];</code>
      */
     private $source_language_code = '';
     /**
-     * Required. The BCP-47 language code to use for translation of the input
+     * Required. The ISO-639 language code to use for translation of the input
      * document. Specify up to 10 language codes here.
      *
      * Generated from protobuf field <code>repeated string target_language_codes = 3 [(.google.api.field_behavior) = REQUIRED];</code>
@@ -92,6 +92,15 @@ class BatchTranslateDocumentRequest extends \Google\Protobuf\Internal\Message
      * Generated from protobuf field <code>map<string, string> format_conversions = 8 [(.google.api.field_behavior) = OPTIONAL];</code>
      */
     private $format_conversions;
+    /**
+     * Optional. This flag is to support user customized attribution.
+     * If not provided, the default is `Machine Translated by Google`.
+     * Customized attribution should follow rules in
+     * https://cloud.google.com/translate/attribution#attribution_and_logos
+     *
+     * Generated from protobuf field <code>string customized_attribution = 10 [(.google.api.field_behavior) = OPTIONAL];</code>
+     */
+    private $customized_attribution = '';
 
     /**
      * Constructor.
@@ -107,11 +116,11 @@ class BatchTranslateDocumentRequest extends \Google\Protobuf\Internal\Message
      *           the same location-id) can be used, otherwise an INVALID_ARGUMENT (400)
      *           error is returned.
      *     @type string $source_language_code
-     *           Required. The BCP-47 language code of the input document if known, for
+     *           Required. The ISO-639 language code of the input document if known, for
      *           example, "en-US" or "sr-Latn". Supported language codes are listed in
-     *           Language Support (https://cloud.google.com/translate/docs/languages).
+     *           [Language Support](https://cloud.google.com/translate/docs/languages).
      *     @type array<string>|\Google\Protobuf\Internal\RepeatedField $target_language_codes
-     *           Required. The BCP-47 language code to use for translation of the input
+     *           Required. The ISO-639 language code to use for translation of the input
      *           document. Specify up to 10 language codes here.
      *     @type array<\Google\Cloud\Translate\V3\BatchDocumentInputConfig>|\Google\Protobuf\Internal\RepeatedField $input_configs
      *           Required. Input configurations.
@@ -144,6 +153,11 @@ class BatchTranslateDocumentRequest extends \Google\Protobuf\Internal\Message
      *             `application/vnd.openxmlformats-officedocument.wordprocessingml.document`
      *           If nothing specified, output files will be in the same format as the
      *           original file.
+     *     @type string $customized_attribution
+     *           Optional. This flag is to support user customized attribution.
+     *           If not provided, the default is `Machine Translated by Google`.
+     *           Customized attribution should follow rules in
+     *           https://cloud.google.com/translate/attribution#attribution_and_logos
      * }
      */
     public function __construct($data = NULL) {
@@ -188,9 +202,9 @@ public function setParent($var)
     }
 
     /**
-     * Required. The BCP-47 language code of the input document if known, for
+     * Required. The ISO-639 language code of the input document if known, for
      * example, "en-US" or "sr-Latn". Supported language codes are listed in
-     * Language Support (https://cloud.google.com/translate/docs/languages).
+     * [Language Support](https://cloud.google.com/translate/docs/languages).
      *
      * Generated from protobuf field <code>string source_language_code = 2 [(.google.api.field_behavior) = REQUIRED];</code>
      * @return string
@@ -201,9 +215,9 @@ public function getSourceLanguageCode()
     }
 
     /**
-     * Required. The BCP-47 language code of the input document if known, for
+     * Required. The ISO-639 language code of the input document if known, for
      * example, "en-US" or "sr-Latn". Supported language codes are listed in
-     * Language Support (https://cloud.google.com/translate/docs/languages).
+     * [Language Support](https://cloud.google.com/translate/docs/languages).
      *
      * Generated from protobuf field <code>string source_language_code = 2 [(.google.api.field_behavior) = REQUIRED];</code>
      * @param string $var
@@ -218,7 +232,7 @@ public function setSourceLanguageCode($var)
     }
 
     /**
-     * Required. The BCP-47 language code to use for translation of the input
+     * Required. The ISO-639 language code to use for translation of the input
      * document. Specify up to 10 language codes here.
      *
      * Generated from protobuf field <code>repeated string target_language_codes = 3 [(.google.api.field_behavior) = REQUIRED];</code>
@@ -230,7 +244,7 @@ public function getTargetLanguageCodes()
     }
 
     /**
-     * Required. The BCP-47 language code to use for translation of the input
+     * Required. The ISO-639 language code to use for translation of the input
      * document. Specify up to 10 language codes here.
      *
      * Generated from protobuf field <code>repeated string target_language_codes = 3 [(.google.api.field_behavior) = REQUIRED];</code>
@@ -427,5 +441,37 @@ public function setFormatConversions($var)
         return $this;
     }
 
+    /**
+     * Optional. This flag is to support user customized attribution.
+     * If not provided, the default is `Machine Translated by Google`.
+     * Customized attribution should follow rules in
+     * https://cloud.google.com/translate/attribution#attribution_and_logos
+     *
+     * Generated from protobuf field <code>string customized_attribution = 10 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @return string
+     */
+    public function getCustomizedAttribution()
+    {
+        return $this->customized_attribution;
+    }
+
+    /**
+     * Optional. This flag is to support user customized attribution.
+     * If not provided, the default is `Machine Translated by Google`.
+     * Customized attribution should follow rules in
+     * https://cloud.google.com/translate/attribution#attribution_and_logos
+     *
+     * Generated from protobuf field <code>string customized_attribution = 10 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setCustomizedAttribution($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->customized_attribution = $var;
+
+        return $this;
+    }
+
 }
 
diff --git a/Translate/src/V3/DetectedLanguage.php b/Translate/src/V3/DetectedLanguage.php
index 22f07300c9e..8d9d6ee4c48 100644
--- a/Translate/src/V3/DetectedLanguage.php
+++ b/Translate/src/V3/DetectedLanguage.php
@@ -16,7 +16,7 @@
 class DetectedLanguage extends \Google\Protobuf\Internal\Message
 {
     /**
-     * The BCP-47 language code of source content in the request, detected
+     * The ISO-639 language code of the source content in the request, detected
      * automatically.
      *
      * Generated from protobuf field <code>string language_code = 1;</code>
@@ -36,7 +36,7 @@ class DetectedLanguage extends \Google\Protobuf\Internal\Message
      *     Optional. Data for populating the Message object.
      *
      *     @type string $language_code
-     *           The BCP-47 language code of source content in the request, detected
+     *           The ISO-639 language code of the source content in the request, detected
      *           automatically.
      *     @type float $confidence
      *           The confidence of the detection result for this language.
@@ -48,7 +48,7 @@ public function __construct($data = NULL) {
     }
 
     /**
-     * The BCP-47 language code of source content in the request, detected
+     * The ISO-639 language code of the source content in the request, detected
      * automatically.
      *
      * Generated from protobuf field <code>string language_code = 1;</code>
@@ -60,7 +60,7 @@ public function getLanguageCode()
     }
 
     /**
-     * The BCP-47 language code of source content in the request, detected
+     * The ISO-639 language code of the source content in the request, detected
      * automatically.
      *
      * Generated from protobuf field <code>string language_code = 1;</code>
diff --git a/Translate/src/V3/Gapic/TranslationServiceGapicClient.php b/Translate/src/V3/Gapic/TranslationServiceGapicClient.php
index 79690128af3..c4997f53c63 100644
--- a/Translate/src/V3/Gapic/TranslationServiceGapicClient.php
+++ b/Translate/src/V3/Gapic/TranslationServiceGapicClient.php
@@ -415,10 +415,10 @@ public function __construct(array $options = [])
      *                                                        Only AutoML Translation models or glossaries within the same region (have
      *                                                        the same location-id) can be used, otherwise an INVALID_ARGUMENT (400)
      *                                                        error is returned.
-     * @param string                     $sourceLanguageCode  Required. The BCP-47 language code of the input document if known, for
+     * @param string                     $sourceLanguageCode  Required. The ISO-639 language code of the input document if known, for
      *                                                        example, "en-US" or "sr-Latn". Supported language codes are listed in
-     *                                                        Language Support (https://cloud.google.com/translate/docs/languages).
-     * @param string[]                   $targetLanguageCodes Required. The BCP-47 language code to use for translation of the input
+     *                                                        [Language Support](https://cloud.google.com/translate/docs/languages).
+     * @param string[]                   $targetLanguageCodes Required. The ISO-639 language code to use for translation of the input
      *                                                        document. Specify up to 10 language codes here.
      * @param BatchDocumentInputConfig[] $inputConfigs        Required. Input configurations.
      *                                                        The total number of files matched should be <= 100.
@@ -459,6 +459,11 @@ public function __construct(array $options = [])
      *
      *           If nothing specified, output files will be in the same format as the
      *           original file.
+     *     @type string $customizedAttribution
+     *           Optional. This flag is to support user customized attribution.
+     *           If not provided, the default is `Machine Translated by Google`.
+     *           Customized attribution should follow rules in
+     *           https://cloud.google.com/translate/attribution#attribution_and_logos
      *     @type RetrySettings|array $retrySettings
      *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
      *           associative array of retry settings parameters. See the documentation on
@@ -491,6 +496,10 @@ public function batchTranslateDocument($parent, $sourceLanguageCode, $targetLang
             $request->setFormatConversions($optionalArgs['formatConversions']);
         }
 
+        if (isset($optionalArgs['customizedAttribution'])) {
+            $request->setCustomizedAttribution($optionalArgs['customizedAttribution']);
+        }
+
         $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
         $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
         return $this->startOperationsCall('BatchTranslateDocument', $optionalArgs, $request, $this->getOperationsClient())->wait();
@@ -1091,14 +1100,14 @@ public function listGlossaries($parent, array $optionalArgs = [])
      *
      *                                                 Models and glossaries must be within the same region (have the same
      *                                                 location-id), otherwise an INVALID_ARGUMENT (400) error is returned.
-     * @param string              $targetLanguageCode  Required. The BCP-47 language code to use for translation of the input
+     * @param string              $targetLanguageCode  Required. The ISO-639 language code to use for translation of the input
      *                                                 document, set to one of the language codes listed in Language Support.
      * @param DocumentInputConfig $documentInputConfig Required. Input configurations.
      * @param array               $optionalArgs        {
      *     Optional.
      *
      *     @type string $sourceLanguageCode
-     *           Optional. The BCP-47 language code of the input document if known, for
+     *           Optional. The ISO-639 language code of the input document if known, for
      *           example, "en-US" or "sr-Latn". Supported language codes are listed in
      *           Language Support. If the source language isn't specified, the API attempts
      *           to identify the source language automatically and returns the source
@@ -1138,6 +1147,19 @@ public function listGlossaries($parent, array $optionalArgs = [])
      *
      *           See https://cloud.google.com/translate/docs/advanced/labels for more
      *           information.
+     *     @type string $customizedAttribution
+     *           Optional. This flag is to support user customized attribution.
+     *           If not provided, the default is `Machine Translated by Google`.
+     *           Customized attribution should follow rules in
+     *           https://cloud.google.com/translate/attribution#attribution_and_logos
+     *     @type bool $isTranslateNativePdfOnly
+     *           Optional. If true, the page limit of online native pdf translation is 300
+     *           and only native pdf pages will be translated.
+     *     @type bool $enableShadowRemovalNativePdf
+     *           Optional. If true, use the text removal to remove the shadow text on
+     *           background image for native pdf translation.
+     *           Shadow removal feature can only be enabled when
+     *           is_translate_native_pdf_only is false
      *     @type RetrySettings|array $retrySettings
      *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
      *           associative array of retry settings parameters. See the documentation on
@@ -1176,6 +1198,18 @@ public function translateDocument($parent, $targetLanguageCode, $documentInputCo
             $request->setLabels($optionalArgs['labels']);
         }
 
+        if (isset($optionalArgs['customizedAttribution'])) {
+            $request->setCustomizedAttribution($optionalArgs['customizedAttribution']);
+        }
+
+        if (isset($optionalArgs['isTranslateNativePdfOnly'])) {
+            $request->setIsTranslateNativePdfOnly($optionalArgs['isTranslateNativePdfOnly']);
+        }
+
+        if (isset($optionalArgs['enableShadowRemovalNativePdf'])) {
+            $request->setEnableShadowRemovalNativePdf($optionalArgs['enableShadowRemovalNativePdf']);
+        }
+
         $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
         $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
         return $this->startCall('TranslateDocument', TranslateDocumentResponse::class, $optionalArgs, $request)->wait();
@@ -1198,10 +1232,9 @@ public function translateDocument($parent, $targetLanguageCode, $documentInputCo
      * ```
      *
      * @param string[] $contents           Required. The content of the input in string format.
-     *                                     We recommend the total content be less than 30k codepoints. The max length
-     *                                     of this field is 1024.
-     *                                     Use BatchTranslateText for larger text.
-     * @param string   $targetLanguageCode Required. The BCP-47 language code to use for translation of the input
+     *                                     We recommend the total content be less than 30,000 codepoints. The max
+     *                                     length of this field is 1024. Use BatchTranslateText for larger text.
+     * @param string   $targetLanguageCode Required. The ISO-639 language code to use for translation of the input
      *                                     text, set to one of the language codes listed in Language Support.
      * @param string   $parent             Required. Project or location to make a call. Must refer to a caller's
      *                                     project.
@@ -1224,7 +1257,7 @@ public function translateDocument($parent, $targetLanguageCode, $documentInputCo
      *           Optional. The format of the source text, for example, "text/html",
      *           "text/plain". If left blank, the MIME type defaults to "text/html".
      *     @type string $sourceLanguageCode
-     *           Optional. The BCP-47 language code of the input text if
+     *           Optional. The ISO-639 language code of the input text if
      *           known, for example, "en-US" or "sr-Latn". Supported language codes are
      *           listed in Language Support. If the source language isn't specified, the API
      *           attempts to identify the source language automatically and returns the
diff --git a/Translate/src/V3/Glossary.php b/Translate/src/V3/Glossary.php
index 5035fe80ea4..74fcad43b5d 100644
--- a/Translate/src/V3/Glossary.php
+++ b/Translate/src/V3/Glossary.php
@@ -9,7 +9,7 @@
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * Represents a glossary built from user provided data.
+ * Represents a glossary built from user-provided data.
  *
  * Generated from protobuf message <code>google.cloud.translation.v3.Glossary</code>
  */
@@ -47,6 +47,12 @@ class Glossary extends \Google\Protobuf\Internal\Message
      * Generated from protobuf field <code>.google.protobuf.Timestamp end_time = 8 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
      */
     private $end_time = null;
+    /**
+     * Optional. The display name of the glossary.
+     *
+     * Generated from protobuf field <code>string display_name = 9 [(.google.api.field_behavior) = OPTIONAL];</code>
+     */
+    private $display_name = '';
     protected $languages;
 
     /**
@@ -71,6 +77,8 @@ class Glossary extends \Google\Protobuf\Internal\Message
      *           Output only. When CreateGlossary was called.
      *     @type \Google\Protobuf\Timestamp $end_time
      *           Output only. When the glossary creation was finished.
+     *     @type string $display_name
+     *           Optional. The display name of the glossary.
      * }
      */
     public function __construct($data = NULL) {
@@ -304,6 +312,32 @@ public function setEndTime($var)
         return $this;
     }
 
+    /**
+     * Optional. The display name of the glossary.
+     *
+     * Generated from protobuf field <code>string display_name = 9 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @return string
+     */
+    public function getDisplayName()
+    {
+        return $this->display_name;
+    }
+
+    /**
+     * Optional. The display name of the glossary.
+     *
+     * Generated from protobuf field <code>string display_name = 9 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setDisplayName($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->display_name = $var;
+
+        return $this;
+    }
+
     /**
      * @return string
      */
diff --git a/Translate/src/V3/Glossary/LanguageCodePair.php b/Translate/src/V3/Glossary/LanguageCodePair.php
index 081c37a713b..32fc3faebda 100644
--- a/Translate/src/V3/Glossary/LanguageCodePair.php
+++ b/Translate/src/V3/Glossary/LanguageCodePair.php
@@ -16,14 +16,14 @@
 class LanguageCodePair extends \Google\Protobuf\Internal\Message
 {
     /**
-     * Required. The BCP-47 language code of the input text, for example,
+     * Required. The ISO-639 language code of the input text, for example,
      * "en-US". Expected to be an exact match for GlossaryTerm.language_code.
      *
      * Generated from protobuf field <code>string source_language_code = 1;</code>
      */
     private $source_language_code = '';
     /**
-     * Required. The BCP-47 language code for translation output, for example,
+     * Required. The ISO-639 language code for translation output, for example,
      * "zh-CN". Expected to be an exact match for GlossaryTerm.language_code.
      *
      * Generated from protobuf field <code>string target_language_code = 2;</code>
@@ -37,10 +37,10 @@ class LanguageCodePair extends \Google\Protobuf\Internal\Message
      *     Optional. Data for populating the Message object.
      *
      *     @type string $source_language_code
-     *           Required. The BCP-47 language code of the input text, for example,
+     *           Required. The ISO-639 language code of the input text, for example,
      *           "en-US". Expected to be an exact match for GlossaryTerm.language_code.
      *     @type string $target_language_code
-     *           Required. The BCP-47 language code for translation output, for example,
+     *           Required. The ISO-639 language code for translation output, for example,
      *           "zh-CN". Expected to be an exact match for GlossaryTerm.language_code.
      * }
      */
@@ -50,7 +50,7 @@ public function __construct($data = NULL) {
     }
 
     /**
-     * Required. The BCP-47 language code of the input text, for example,
+     * Required. The ISO-639 language code of the input text, for example,
      * "en-US". Expected to be an exact match for GlossaryTerm.language_code.
      *
      * Generated from protobuf field <code>string source_language_code = 1;</code>
@@ -62,7 +62,7 @@ public function getSourceLanguageCode()
     }
 
     /**
-     * Required. The BCP-47 language code of the input text, for example,
+     * Required. The ISO-639 language code of the input text, for example,
      * "en-US". Expected to be an exact match for GlossaryTerm.language_code.
      *
      * Generated from protobuf field <code>string source_language_code = 1;</code>
@@ -78,7 +78,7 @@ public function setSourceLanguageCode($var)
     }
 
     /**
-     * Required. The BCP-47 language code for translation output, for example,
+     * Required. The ISO-639 language code for translation output, for example,
      * "zh-CN". Expected to be an exact match for GlossaryTerm.language_code.
      *
      * Generated from protobuf field <code>string target_language_code = 2;</code>
@@ -90,7 +90,7 @@ public function getTargetLanguageCode()
     }
 
     /**
-     * Required. The BCP-47 language code for translation output, for example,
+     * Required. The ISO-639 language code for translation output, for example,
      * "zh-CN". Expected to be an exact match for GlossaryTerm.language_code.
      *
      * Generated from protobuf field <code>string target_language_code = 2;</code>
diff --git a/Translate/src/V3/Glossary/LanguageCodesSet.php b/Translate/src/V3/Glossary/LanguageCodesSet.php
index aa8c14f638b..164d340406c 100644
--- a/Translate/src/V3/Glossary/LanguageCodesSet.php
+++ b/Translate/src/V3/Glossary/LanguageCodesSet.php
@@ -16,7 +16,7 @@
 class LanguageCodesSet extends \Google\Protobuf\Internal\Message
 {
     /**
-     * The BCP-47 language code(s) for terms defined in the glossary.
+     * The ISO-639 language code(s) for terms defined in the glossary.
      * All entries are unique. The list contains at least two entries.
      * Expected to be an exact match for GlossaryTerm.language_code.
      *
@@ -31,7 +31,7 @@ class LanguageCodesSet extends \Google\Protobuf\Internal\Message
      *     Optional. Data for populating the Message object.
      *
      *     @type array<string>|\Google\Protobuf\Internal\RepeatedField $language_codes
-     *           The BCP-47 language code(s) for terms defined in the glossary.
+     *           The ISO-639 language code(s) for terms defined in the glossary.
      *           All entries are unique. The list contains at least two entries.
      *           Expected to be an exact match for GlossaryTerm.language_code.
      * }
@@ -42,7 +42,7 @@ public function __construct($data = NULL) {
     }
 
     /**
-     * The BCP-47 language code(s) for terms defined in the glossary.
+     * The ISO-639 language code(s) for terms defined in the glossary.
      * All entries are unique. The list contains at least two entries.
      * Expected to be an exact match for GlossaryTerm.language_code.
      *
@@ -55,7 +55,7 @@ public function getLanguageCodes()
     }
 
     /**
-     * The BCP-47 language code(s) for terms defined in the glossary.
+     * The ISO-639 language code(s) for terms defined in the glossary.
      * All entries are unique. The list contains at least two entries.
      * Expected to be an exact match for GlossaryTerm.language_code.
      *
diff --git a/Translate/src/V3/GlossaryInputConfig.php b/Translate/src/V3/GlossaryInputConfig.php
index d1d24714390..a5800834223 100644
--- a/Translate/src/V3/GlossaryInputConfig.php
+++ b/Translate/src/V3/GlossaryInputConfig.php
@@ -30,10 +30,10 @@ class GlossaryInputConfig extends \Google\Protobuf\Internal\Message
      *           formats. Wildcards are not allowed. This must be a single file in one of
      *           the following formats:
      *           For unidirectional glossaries:
-     *           - TSV/CSV (`.tsv`/`.csv`): 2 column file, tab- or comma-separated.
+     *           - TSV/CSV (`.tsv`/`.csv`): Two column file, tab- or comma-separated.
      *             The first column is source text. The second column is target text.
-     *             The file must not contain headers. That is, the first row is data, not
-     *             column names.
+     *             No headers in this file. The first row contains data and not column
+     *             names.
      *           - TMX (`.tmx`): TMX file with parallel data defining source/target term
      *           pairs.
      *           For equivalent term sets glossaries:
@@ -54,10 +54,10 @@ public function __construct($data = NULL) {
      * formats. Wildcards are not allowed. This must be a single file in one of
      * the following formats:
      * For unidirectional glossaries:
-     * - TSV/CSV (`.tsv`/`.csv`): 2 column file, tab- or comma-separated.
+     * - TSV/CSV (`.tsv`/`.csv`): Two column file, tab- or comma-separated.
      *   The first column is source text. The second column is target text.
-     *   The file must not contain headers. That is, the first row is data, not
-     *   column names.
+     *   No headers in this file. The first row contains data and not column
+     *   names.
      * - TMX (`.tmx`): TMX file with parallel data defining source/target term
      * pairs.
      * For equivalent term sets glossaries:
@@ -85,10 +85,10 @@ public function hasGcsSource()
      * formats. Wildcards are not allowed. This must be a single file in one of
      * the following formats:
      * For unidirectional glossaries:
-     * - TSV/CSV (`.tsv`/`.csv`): 2 column file, tab- or comma-separated.
+     * - TSV/CSV (`.tsv`/`.csv`): Two column file, tab- or comma-separated.
      *   The first column is source text. The second column is target text.
-     *   The file must not contain headers. That is, the first row is data, not
-     *   column names.
+     *   No headers in this file. The first row contains data and not column
+     *   names.
      * - TMX (`.tmx`): TMX file with parallel data defining source/target term
      * pairs.
      * For equivalent term sets glossaries:
diff --git a/Translate/src/V3/OutputConfig.php b/Translate/src/V3/OutputConfig.php
index e6b91925abc..4059eea266f 100644
--- a/Translate/src/V3/OutputConfig.php
+++ b/Translate/src/V3/OutputConfig.php
@@ -53,7 +53,7 @@ class OutputConfig extends \Google\Protobuf\Internal\Message
      *           Since index.csv will be keeping updated during the process, please make
      *           sure there is no custom retention policy applied on the output bucket
      *           that may avoid file updating.
-     *           (https://cloud.google.com/storage/docs/bucket-lock?hl=en#retention-policy)
+     *           (https://cloud.google.com/storage/docs/bucket-lock#retention-policy)
      *           The format of translations_file (for target language code 'trg') is:
      *           `gs://translation_test/a_b_c_'trg'_translations.[extension]`
      *           If the input file extension is tsv, the output has the following
@@ -120,7 +120,7 @@ public function __construct($data = NULL) {
      * Since index.csv will be keeping updated during the process, please make
      * sure there is no custom retention policy applied on the output bucket
      * that may avoid file updating.
-     * (https://cloud.google.com/storage/docs/bucket-lock?hl=en#retention-policy)
+     * (https://cloud.google.com/storage/docs/bucket-lock#retention-policy)
      * The format of translations_file (for target language code 'trg') is:
      * `gs://translation_test/a_b_c_'trg'_translations.[extension]`
      * If the input file extension is tsv, the output has the following
@@ -194,7 +194,7 @@ public function hasGcsDestination()
      * Since index.csv will be keeping updated during the process, please make
      * sure there is no custom retention policy applied on the output bucket
      * that may avoid file updating.
-     * (https://cloud.google.com/storage/docs/bucket-lock?hl=en#retention-policy)
+     * (https://cloud.google.com/storage/docs/bucket-lock#retention-policy)
      * The format of translations_file (for target language code 'trg') is:
      * `gs://translation_test/a_b_c_'trg'_translations.[extension]`
      * If the input file extension is tsv, the output has the following
diff --git a/Translate/src/V3/SupportedLanguage.php b/Translate/src/V3/SupportedLanguage.php
index f0492b9eb1b..693d120494d 100644
--- a/Translate/src/V3/SupportedLanguage.php
+++ b/Translate/src/V3/SupportedLanguage.php
@@ -18,28 +18,28 @@ class SupportedLanguage extends \Google\Protobuf\Internal\Message
 {
     /**
      * Supported language code, generally consisting of its ISO 639-1
-     * identifier, for example, 'en', 'ja'. In certain cases, BCP-47 codes
+     * identifier, for example, 'en', 'ja'. In certain cases, ISO-639 codes
      * including language and region identifiers are returned (for example,
-     * 'zh-TW' and 'zh-CN')
+     * 'zh-TW' and 'zh-CN').
      *
      * Generated from protobuf field <code>string language_code = 1;</code>
      */
     private $language_code = '';
     /**
-     * Human readable name of the language localized in the display language
+     * Human-readable name of the language localized in the display language
      * specified in the request.
      *
      * Generated from protobuf field <code>string display_name = 2;</code>
      */
     private $display_name = '';
     /**
-     * Can be used as source language.
+     * Can be used as a source language.
      *
      * Generated from protobuf field <code>bool support_source = 3;</code>
      */
     private $support_source = false;
     /**
-     * Can be used as target language.
+     * Can be used as a target language.
      *
      * Generated from protobuf field <code>bool support_target = 4;</code>
      */
@@ -53,16 +53,16 @@ class SupportedLanguage extends \Google\Protobuf\Internal\Message
      *
      *     @type string $language_code
      *           Supported language code, generally consisting of its ISO 639-1
-     *           identifier, for example, 'en', 'ja'. In certain cases, BCP-47 codes
+     *           identifier, for example, 'en', 'ja'. In certain cases, ISO-639 codes
      *           including language and region identifiers are returned (for example,
-     *           'zh-TW' and 'zh-CN')
+     *           'zh-TW' and 'zh-CN').
      *     @type string $display_name
-     *           Human readable name of the language localized in the display language
+     *           Human-readable name of the language localized in the display language
      *           specified in the request.
      *     @type bool $support_source
-     *           Can be used as source language.
+     *           Can be used as a source language.
      *     @type bool $support_target
-     *           Can be used as target language.
+     *           Can be used as a target language.
      * }
      */
     public function __construct($data = NULL) {
@@ -72,9 +72,9 @@ public function __construct($data = NULL) {
 
     /**
      * Supported language code, generally consisting of its ISO 639-1
-     * identifier, for example, 'en', 'ja'. In certain cases, BCP-47 codes
+     * identifier, for example, 'en', 'ja'. In certain cases, ISO-639 codes
      * including language and region identifiers are returned (for example,
-     * 'zh-TW' and 'zh-CN')
+     * 'zh-TW' and 'zh-CN').
      *
      * Generated from protobuf field <code>string language_code = 1;</code>
      * @return string
@@ -86,9 +86,9 @@ public function getLanguageCode()
 
     /**
      * Supported language code, generally consisting of its ISO 639-1
-     * identifier, for example, 'en', 'ja'. In certain cases, BCP-47 codes
+     * identifier, for example, 'en', 'ja'. In certain cases, ISO-639 codes
      * including language and region identifiers are returned (for example,
-     * 'zh-TW' and 'zh-CN')
+     * 'zh-TW' and 'zh-CN').
      *
      * Generated from protobuf field <code>string language_code = 1;</code>
      * @param string $var
@@ -103,7 +103,7 @@ public function setLanguageCode($var)
     }
 
     /**
-     * Human readable name of the language localized in the display language
+     * Human-readable name of the language localized in the display language
      * specified in the request.
      *
      * Generated from protobuf field <code>string display_name = 2;</code>
@@ -115,7 +115,7 @@ public function getDisplayName()
     }
 
     /**
-     * Human readable name of the language localized in the display language
+     * Human-readable name of the language localized in the display language
      * specified in the request.
      *
      * Generated from protobuf field <code>string display_name = 2;</code>
@@ -131,7 +131,7 @@ public function setDisplayName($var)
     }
 
     /**
-     * Can be used as source language.
+     * Can be used as a source language.
      *
      * Generated from protobuf field <code>bool support_source = 3;</code>
      * @return bool
@@ -142,7 +142,7 @@ public function getSupportSource()
     }
 
     /**
-     * Can be used as source language.
+     * Can be used as a source language.
      *
      * Generated from protobuf field <code>bool support_source = 3;</code>
      * @param bool $var
@@ -157,7 +157,7 @@ public function setSupportSource($var)
     }
 
     /**
-     * Can be used as target language.
+     * Can be used as a target language.
      *
      * Generated from protobuf field <code>bool support_target = 4;</code>
      * @return bool
@@ -168,7 +168,7 @@ public function getSupportTarget()
     }
 
     /**
-     * Can be used as target language.
+     * Can be used as a target language.
      *
      * Generated from protobuf field <code>bool support_target = 4;</code>
      * @param bool $var
diff --git a/Translate/src/V3/TranslateDocumentRequest.php b/Translate/src/V3/TranslateDocumentRequest.php
index 4f7e119ab03..214deb092ce 100644
--- a/Translate/src/V3/TranslateDocumentRequest.php
+++ b/Translate/src/V3/TranslateDocumentRequest.php
@@ -29,7 +29,7 @@ class TranslateDocumentRequest extends \Google\Protobuf\Internal\Message
      */
     private $parent = '';
     /**
-     * Optional. The BCP-47 language code of the input document if known, for
+     * Optional. The ISO-639 language code of the input document if known, for
      * example, "en-US" or "sr-Latn". Supported language codes are listed in
      * Language Support. If the source language isn't specified, the API attempts
      * to identify the source language automatically and returns the source
@@ -40,7 +40,7 @@ class TranslateDocumentRequest extends \Google\Protobuf\Internal\Message
      */
     private $source_language_code = '';
     /**
-     * Required. The BCP-47 language code to use for translation of the input
+     * Required. The ISO-639 language code to use for translation of the input
      * document, set to one of the language codes listed in Language Support.
      *
      * Generated from protobuf field <code>string target_language_code = 3 [(.google.api.field_behavior) = REQUIRED];</code>
@@ -95,6 +95,31 @@ class TranslateDocumentRequest extends \Google\Protobuf\Internal\Message
      * Generated from protobuf field <code>map<string, string> labels = 8 [(.google.api.field_behavior) = OPTIONAL];</code>
      */
     private $labels;
+    /**
+     * Optional. This flag is to support user customized attribution.
+     * If not provided, the default is `Machine Translated by Google`.
+     * Customized attribution should follow rules in
+     * https://cloud.google.com/translate/attribution#attribution_and_logos
+     *
+     * Generated from protobuf field <code>string customized_attribution = 10 [(.google.api.field_behavior) = OPTIONAL];</code>
+     */
+    private $customized_attribution = '';
+    /**
+     * Optional. If true, the page limit of online native pdf translation is 300
+     * and only native pdf pages will be translated.
+     *
+     * Generated from protobuf field <code>bool is_translate_native_pdf_only = 11 [(.google.api.field_behavior) = OPTIONAL];</code>
+     */
+    private $is_translate_native_pdf_only = false;
+    /**
+     * Optional. If true, use the text removal to remove the shadow text on
+     * background image for native pdf translation.
+     * Shadow removal feature can only be enabled when
+     * is_translate_native_pdf_only is false
+     *
+     * Generated from protobuf field <code>bool enable_shadow_removal_native_pdf = 12 [(.google.api.field_behavior) = OPTIONAL];</code>
+     */
+    private $enable_shadow_removal_native_pdf = false;
 
     /**
      * Constructor.
@@ -112,14 +137,14 @@ class TranslateDocumentRequest extends \Google\Protobuf\Internal\Message
      *           Models and glossaries must be within the same region (have the same
      *           location-id), otherwise an INVALID_ARGUMENT (400) error is returned.
      *     @type string $source_language_code
-     *           Optional. The BCP-47 language code of the input document if known, for
+     *           Optional. The ISO-639 language code of the input document if known, for
      *           example, "en-US" or "sr-Latn". Supported language codes are listed in
      *           Language Support. If the source language isn't specified, the API attempts
      *           to identify the source language automatically and returns the source
      *           language within the response. Source language must be specified if the
      *           request contains a glossary or a custom model.
      *     @type string $target_language_code
-     *           Required. The BCP-47 language code to use for translation of the input
+     *           Required. The ISO-639 language code to use for translation of the input
      *           document, set to one of the language codes listed in Language Support.
      *     @type \Google\Cloud\Translate\V3\DocumentInputConfig $document_input_config
      *           Required. Input configurations.
@@ -150,6 +175,19 @@ class TranslateDocumentRequest extends \Google\Protobuf\Internal\Message
      *           are optional. Label keys must start with a letter.
      *           See https://cloud.google.com/translate/docs/advanced/labels for more
      *           information.
+     *     @type string $customized_attribution
+     *           Optional. This flag is to support user customized attribution.
+     *           If not provided, the default is `Machine Translated by Google`.
+     *           Customized attribution should follow rules in
+     *           https://cloud.google.com/translate/attribution#attribution_and_logos
+     *     @type bool $is_translate_native_pdf_only
+     *           Optional. If true, the page limit of online native pdf translation is 300
+     *           and only native pdf pages will be translated.
+     *     @type bool $enable_shadow_removal_native_pdf
+     *           Optional. If true, use the text removal to remove the shadow text on
+     *           background image for native pdf translation.
+     *           Shadow removal feature can only be enabled when
+     *           is_translate_native_pdf_only is false
      * }
      */
     public function __construct($data = NULL) {
@@ -198,7 +236,7 @@ public function setParent($var)
     }
 
     /**
-     * Optional. The BCP-47 language code of the input document if known, for
+     * Optional. The ISO-639 language code of the input document if known, for
      * example, "en-US" or "sr-Latn". Supported language codes are listed in
      * Language Support. If the source language isn't specified, the API attempts
      * to identify the source language automatically and returns the source
@@ -214,7 +252,7 @@ public function getSourceLanguageCode()
     }
 
     /**
-     * Optional. The BCP-47 language code of the input document if known, for
+     * Optional. The ISO-639 language code of the input document if known, for
      * example, "en-US" or "sr-Latn". Supported language codes are listed in
      * Language Support. If the source language isn't specified, the API attempts
      * to identify the source language automatically and returns the source
@@ -234,7 +272,7 @@ public function setSourceLanguageCode($var)
     }
 
     /**
-     * Required. The BCP-47 language code to use for translation of the input
+     * Required. The ISO-639 language code to use for translation of the input
      * document, set to one of the language codes listed in Language Support.
      *
      * Generated from protobuf field <code>string target_language_code = 3 [(.google.api.field_behavior) = REQUIRED];</code>
@@ -246,7 +284,7 @@ public function getTargetLanguageCode()
     }
 
     /**
-     * Required. The BCP-47 language code to use for translation of the input
+     * Required. The ISO-639 language code to use for translation of the input
      * document, set to one of the language codes listed in Language Support.
      *
      * Generated from protobuf field <code>string target_language_code = 3 [(.google.api.field_behavior) = REQUIRED];</code>
@@ -459,5 +497,97 @@ public function setLabels($var)
         return $this;
     }
 
+    /**
+     * Optional. This flag is to support user customized attribution.
+     * If not provided, the default is `Machine Translated by Google`.
+     * Customized attribution should follow rules in
+     * https://cloud.google.com/translate/attribution#attribution_and_logos
+     *
+     * Generated from protobuf field <code>string customized_attribution = 10 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @return string
+     */
+    public function getCustomizedAttribution()
+    {
+        return $this->customized_attribution;
+    }
+
+    /**
+     * Optional. This flag is to support user customized attribution.
+     * If not provided, the default is `Machine Translated by Google`.
+     * Customized attribution should follow rules in
+     * https://cloud.google.com/translate/attribution#attribution_and_logos
+     *
+     * Generated from protobuf field <code>string customized_attribution = 10 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setCustomizedAttribution($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->customized_attribution = $var;
+
+        return $this;
+    }
+
+    /**
+     * Optional. If true, the page limit of online native pdf translation is 300
+     * and only native pdf pages will be translated.
+     *
+     * Generated from protobuf field <code>bool is_translate_native_pdf_only = 11 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @return bool
+     */
+    public function getIsTranslateNativePdfOnly()
+    {
+        return $this->is_translate_native_pdf_only;
+    }
+
+    /**
+     * Optional. If true, the page limit of online native pdf translation is 300
+     * and only native pdf pages will be translated.
+     *
+     * Generated from protobuf field <code>bool is_translate_native_pdf_only = 11 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @param bool $var
+     * @return $this
+     */
+    public function setIsTranslateNativePdfOnly($var)
+    {
+        GPBUtil::checkBool($var);
+        $this->is_translate_native_pdf_only = $var;
+
+        return $this;
+    }
+
+    /**
+     * Optional. If true, use the text removal to remove the shadow text on
+     * background image for native pdf translation.
+     * Shadow removal feature can only be enabled when
+     * is_translate_native_pdf_only is false
+     *
+     * Generated from protobuf field <code>bool enable_shadow_removal_native_pdf = 12 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @return bool
+     */
+    public function getEnableShadowRemovalNativePdf()
+    {
+        return $this->enable_shadow_removal_native_pdf;
+    }
+
+    /**
+     * Optional. If true, use the text removal to remove the shadow text on
+     * background image for native pdf translation.
+     * Shadow removal feature can only be enabled when
+     * is_translate_native_pdf_only is false
+     *
+     * Generated from protobuf field <code>bool enable_shadow_removal_native_pdf = 12 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @param bool $var
+     * @return $this
+     */
+    public function setEnableShadowRemovalNativePdf($var)
+    {
+        GPBUtil::checkBool($var);
+        $this->enable_shadow_removal_native_pdf = $var;
+
+        return $this;
+    }
+
 }
 
diff --git a/Translate/src/V3/TranslateTextGlossaryConfig.php b/Translate/src/V3/TranslateTextGlossaryConfig.php
index 309e29da807..b5a3f07f69e 100644
--- a/Translate/src/V3/TranslateTextGlossaryConfig.php
+++ b/Translate/src/V3/TranslateTextGlossaryConfig.php
@@ -18,16 +18,16 @@ class TranslateTextGlossaryConfig extends \Google\Protobuf\Internal\Message
 {
     /**
      * Required. The `glossary` to be applied for this translation.
-     * The format depends on glossary:
-     * - User provided custom glossary:
+     * The format depends on the glossary:
+     * - User-provided custom glossary:
      *   `projects/{project-number-or-id}/locations/{location-id}/glossaries/{glossary-id}`
      *
      * Generated from protobuf field <code>string glossary = 1 [(.google.api.field_behavior) = REQUIRED];</code>
      */
     private $glossary = '';
     /**
-     * Optional. Indicates match is case-insensitive.
-     * Default value is false if missing.
+     * Optional. Indicates match is case insensitive. The default value is `false`
+     * if missing.
      *
      * Generated from protobuf field <code>bool ignore_case = 2 [(.google.api.field_behavior) = OPTIONAL];</code>
      */
@@ -41,12 +41,12 @@ class TranslateTextGlossaryConfig extends \Google\Protobuf\Internal\Message
      *
      *     @type string $glossary
      *           Required. The `glossary` to be applied for this translation.
-     *           The format depends on glossary:
-     *           - User provided custom glossary:
+     *           The format depends on the glossary:
+     *           - User-provided custom glossary:
      *             `projects/{project-number-or-id}/locations/{location-id}/glossaries/{glossary-id}`
      *     @type bool $ignore_case
-     *           Optional. Indicates match is case-insensitive.
-     *           Default value is false if missing.
+     *           Optional. Indicates match is case insensitive. The default value is `false`
+     *           if missing.
      * }
      */
     public function __construct($data = NULL) {
@@ -56,8 +56,8 @@ public function __construct($data = NULL) {
 
     /**
      * Required. The `glossary` to be applied for this translation.
-     * The format depends on glossary:
-     * - User provided custom glossary:
+     * The format depends on the glossary:
+     * - User-provided custom glossary:
      *   `projects/{project-number-or-id}/locations/{location-id}/glossaries/{glossary-id}`
      *
      * Generated from protobuf field <code>string glossary = 1 [(.google.api.field_behavior) = REQUIRED];</code>
@@ -70,8 +70,8 @@ public function getGlossary()
 
     /**
      * Required. The `glossary` to be applied for this translation.
-     * The format depends on glossary:
-     * - User provided custom glossary:
+     * The format depends on the glossary:
+     * - User-provided custom glossary:
      *   `projects/{project-number-or-id}/locations/{location-id}/glossaries/{glossary-id}`
      *
      * Generated from protobuf field <code>string glossary = 1 [(.google.api.field_behavior) = REQUIRED];</code>
@@ -87,8 +87,8 @@ public function setGlossary($var)
     }
 
     /**
-     * Optional. Indicates match is case-insensitive.
-     * Default value is false if missing.
+     * Optional. Indicates match is case insensitive. The default value is `false`
+     * if missing.
      *
      * Generated from protobuf field <code>bool ignore_case = 2 [(.google.api.field_behavior) = OPTIONAL];</code>
      * @return bool
@@ -99,8 +99,8 @@ public function getIgnoreCase()
     }
 
     /**
-     * Optional. Indicates match is case-insensitive.
-     * Default value is false if missing.
+     * Optional. Indicates match is case insensitive. The default value is `false`
+     * if missing.
      *
      * Generated from protobuf field <code>bool ignore_case = 2 [(.google.api.field_behavior) = OPTIONAL];</code>
      * @param bool $var
diff --git a/Translate/src/V3/TranslateTextRequest.php b/Translate/src/V3/TranslateTextRequest.php
index 7efcc52db44..bb5858479eb 100644
--- a/Translate/src/V3/TranslateTextRequest.php
+++ b/Translate/src/V3/TranslateTextRequest.php
@@ -17,9 +17,8 @@ class TranslateTextRequest extends \Google\Protobuf\Internal\Message
 {
     /**
      * Required. The content of the input in string format.
-     * We recommend the total content be less than 30k codepoints. The max length
-     * of this field is 1024.
-     * Use BatchTranslateText for larger text.
+     * We recommend the total content be less than 30,000 codepoints. The max
+     * length of this field is 1024. Use BatchTranslateText for larger text.
      *
      * Generated from protobuf field <code>repeated string contents = 1 [(.google.api.field_behavior) = REQUIRED];</code>
      */
@@ -32,7 +31,7 @@ class TranslateTextRequest extends \Google\Protobuf\Internal\Message
      */
     private $mime_type = '';
     /**
-     * Optional. The BCP-47 language code of the input text if
+     * Optional. The ISO-639 language code of the input text if
      * known, for example, "en-US" or "sr-Latn". Supported language codes are
      * listed in Language Support. If the source language isn't specified, the API
      * attempts to identify the source language automatically and returns the
@@ -42,7 +41,7 @@ class TranslateTextRequest extends \Google\Protobuf\Internal\Message
      */
     private $source_language_code = '';
     /**
-     * Required. The BCP-47 language code to use for translation of the input
+     * Required. The ISO-639 language code to use for translation of the input
      * text, set to one of the language codes listed in Language Support.
      *
      * Generated from protobuf field <code>string target_language_code = 5 [(.google.api.field_behavior) = REQUIRED];</code>
@@ -107,20 +106,19 @@ class TranslateTextRequest extends \Google\Protobuf\Internal\Message
      *
      *     @type array<string>|\Google\Protobuf\Internal\RepeatedField $contents
      *           Required. The content of the input in string format.
-     *           We recommend the total content be less than 30k codepoints. The max length
-     *           of this field is 1024.
-     *           Use BatchTranslateText for larger text.
+     *           We recommend the total content be less than 30,000 codepoints. The max
+     *           length of this field is 1024. Use BatchTranslateText for larger text.
      *     @type string $mime_type
      *           Optional. The format of the source text, for example, "text/html",
      *            "text/plain". If left blank, the MIME type defaults to "text/html".
      *     @type string $source_language_code
-     *           Optional. The BCP-47 language code of the input text if
+     *           Optional. The ISO-639 language code of the input text if
      *           known, for example, "en-US" or "sr-Latn". Supported language codes are
      *           listed in Language Support. If the source language isn't specified, the API
      *           attempts to identify the source language automatically and returns the
      *           source language within the response.
      *     @type string $target_language_code
-     *           Required. The BCP-47 language code to use for translation of the input
+     *           Required. The ISO-639 language code to use for translation of the input
      *           text, set to one of the language codes listed in Language Support.
      *     @type string $parent
      *           Required. Project or location to make a call. Must refer to a caller's
@@ -165,9 +163,8 @@ public function __construct($data = NULL) {
 
     /**
      * Required. The content of the input in string format.
-     * We recommend the total content be less than 30k codepoints. The max length
-     * of this field is 1024.
-     * Use BatchTranslateText for larger text.
+     * We recommend the total content be less than 30,000 codepoints. The max
+     * length of this field is 1024. Use BatchTranslateText for larger text.
      *
      * Generated from protobuf field <code>repeated string contents = 1 [(.google.api.field_behavior) = REQUIRED];</code>
      * @return \Google\Protobuf\Internal\RepeatedField
@@ -179,9 +176,8 @@ public function getContents()
 
     /**
      * Required. The content of the input in string format.
-     * We recommend the total content be less than 30k codepoints. The max length
-     * of this field is 1024.
-     * Use BatchTranslateText for larger text.
+     * We recommend the total content be less than 30,000 codepoints. The max
+     * length of this field is 1024. Use BatchTranslateText for larger text.
      *
      * Generated from protobuf field <code>repeated string contents = 1 [(.google.api.field_behavior) = REQUIRED];</code>
      * @param array<string>|\Google\Protobuf\Internal\RepeatedField $var
@@ -224,7 +220,7 @@ public function setMimeType($var)
     }
 
     /**
-     * Optional. The BCP-47 language code of the input text if
+     * Optional. The ISO-639 language code of the input text if
      * known, for example, "en-US" or "sr-Latn". Supported language codes are
      * listed in Language Support. If the source language isn't specified, the API
      * attempts to identify the source language automatically and returns the
@@ -239,7 +235,7 @@ public function getSourceLanguageCode()
     }
 
     /**
-     * Optional. The BCP-47 language code of the input text if
+     * Optional. The ISO-639 language code of the input text if
      * known, for example, "en-US" or "sr-Latn". Supported language codes are
      * listed in Language Support. If the source language isn't specified, the API
      * attempts to identify the source language automatically and returns the
@@ -258,7 +254,7 @@ public function setSourceLanguageCode($var)
     }
 
     /**
-     * Required. The BCP-47 language code to use for translation of the input
+     * Required. The ISO-639 language code to use for translation of the input
      * text, set to one of the language codes listed in Language Support.
      *
      * Generated from protobuf field <code>string target_language_code = 5 [(.google.api.field_behavior) = REQUIRED];</code>
@@ -270,7 +266,7 @@ public function getTargetLanguageCode()
     }
 
     /**
-     * Required. The BCP-47 language code to use for translation of the input
+     * Required. The ISO-639 language code to use for translation of the input
      * text, set to one of the language codes listed in Language Support.
      *
      * Generated from protobuf field <code>string target_language_code = 5 [(.google.api.field_behavior) = REQUIRED];</code>
diff --git a/Translate/src/V3/Translation.php b/Translate/src/V3/Translation.php
index 2ecc3ab81fb..82722a76ebe 100644
--- a/Translate/src/V3/Translation.php
+++ b/Translate/src/V3/Translation.php
@@ -36,7 +36,7 @@ class Translation extends \Google\Protobuf\Internal\Message
      */
     private $model = '';
     /**
-     * The BCP-47 language code of source text in the initial request, detected
+     * The ISO-639 language code of source text in the initial request, detected
      * automatically, if no source language was passed within the initial
      * request. If the source language was passed, auto-detection of the language
      * does not occur and this field is empty.
@@ -70,7 +70,7 @@ class Translation extends \Google\Protobuf\Internal\Message
      *           `model` here would be normalized to
      *           `projects/{project-number}/locations/{location-id}/models/general/nmt`.
      *     @type string $detected_language_code
-     *           The BCP-47 language code of source text in the initial request, detected
+     *           The ISO-639 language code of source text in the initial request, detected
      *           automatically, if no source language was passed within the initial
      *           request. If the source language was passed, auto-detection of the language
      *           does not occur and this field is empty.
@@ -152,7 +152,7 @@ public function setModel($var)
     }
 
     /**
-     * The BCP-47 language code of source text in the initial request, detected
+     * The ISO-639 language code of source text in the initial request, detected
      * automatically, if no source language was passed within the initial
      * request. If the source language was passed, auto-detection of the language
      * does not occur and this field is empty.
@@ -166,7 +166,7 @@ public function getDetectedLanguageCode()
     }
 
     /**
-     * The BCP-47 language code of source text in the initial request, detected
+     * The ISO-639 language code of source text in the initial request, detected
      * automatically, if no source language was passed within the initial
      * request. If the source language was passed, auto-detection of the language
      * does not occur and this field is empty.
diff --git a/Translate/tests/Unit/V3/TranslationServiceClientTest.php b/Translate/tests/Unit/V3/TranslationServiceClientTest.php
index 7e833c2cae0..da38d3bf29b 100644
--- a/Translate/tests/Unit/V3/TranslationServiceClientTest.php
+++ b/Translate/tests/Unit/V3/TranslationServiceClientTest.php
@@ -385,9 +385,11 @@ public function createGlossaryTest()
         $transport->addResponse($incompleteOperation);
         $name = 'name3373707';
         $entryCount = 811131134;
+        $displayName = 'displayName1615086568';
         $expectedResponse = new Glossary();
         $expectedResponse->setName($name);
         $expectedResponse->setEntryCount($entryCount);
+        $expectedResponse->setDisplayName($displayName);
         $anyResponse = new Any();
         $anyResponse->setValue($expectedResponse->serializeToString());
         $completeOperation = new Operation();
@@ -679,9 +681,11 @@ public function getGlossaryTest()
         // Mock response
         $name2 = 'name2-1052831874';
         $entryCount = 811131134;
+        $displayName = 'displayName1615086568';
         $expectedResponse = new Glossary();
         $expectedResponse->setName($name2);
         $expectedResponse->setEntryCount($entryCount);
+        $expectedResponse->setDisplayName($displayName);
         $transport->addResponse($expectedResponse);
         // Mock request
         $formattedName = $gapicClient->glossaryName('[PROJECT]', '[LOCATION]', '[GLOSSARY]');