[4.3] add missing deprecated note for #39453

[jgerman-bot]

New language relevant PR in upstream repo: joomla/joomla-cms#39619 Here are the upstream changes:

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diff --git a/language/en-GB/com_media.ini b/language/en-GB/com_media.ini
index 0b9e0211bc2a..e8c566849163 100644
--- a/language/en-GB/com_media.ini
+++ b/language/en-GB/com_media.ini
@@ -52,7 +52,9 @@ COM_MEDIA_FIELD_CHECK_MIME_DESC="Use MIME Magic or Fileinfo to try to verify fil
 COM_MEDIA_FIELD_CHECK_MIME_LABEL="Check MIME Types"
 COM_MEDIA_FIELD_IGNORED_EXTENSIONS_DESC="Ignored file extensions for MIME type checking and restricted uploads."
 COM_MEDIA_FIELD_IGNORED_EXTENSIONS_LABEL="Ignored Extensions"
+; Deprecated, will be removed with 5.0
 COM_MEDIA_FIELD_ILLEGAL_MIME_TYPES_DESC="A comma separated list of forbidden MIME types to upload."
+; Deprecated, will be removed with 5.0
 COM_MEDIA_FIELD_ILLEGAL_MIME_TYPES_LABEL="Forbidden MIME Types"
 COM_MEDIA_FIELD_LEGAL_EXTENSIONS_DESC="Extensions (file types) you are allowed to upload (comma separated)."
 COM_MEDIA_FIELD_LEGAL_EXTENSIONS_LABEL="Legal Extensions (File Types)"