[5.0] Remove IE 11 warning message due to EOL

[jgerman-bot]

New language relevant PR in upstream repo: joomla/joomla-cms#39018 Here are the upstream changes:

Click to expand the diff!

diff --git a/administrator/language/en-GB/joomla.ini b/administrator/language/en-GB/joomla.ini
index 1afcbb710aff..4c10fdd2ac3a 100644
--- a/administrator/language/en-GB/joomla.ini
+++ b/administrator/language/en-GB/joomla.ini
@@ -692,6 +692,7 @@ JGLOBAL_VOTES="Votes"
 JGLOBAL_VOTES_ASC="Votes ascending"
 JGLOBAL_VOTES_DESC="Votes descending"
 JGLOBAL_WARNCOOKIES="Warning! Cookies must be enabled to access the Administrator Backend."
+; @deprecated 5.0 will be removed in 6.0
 JGLOBAL_WARNIE="Warning! Internet Explorer should not be used for proper operation of the Administrator Backend."
 JGLOBAL_WARNJAVASCRIPT="Warning! JavaScript must be enabled for proper operation of the Administrator Backend."
 JGLOBAL_WIDTH="Width"
diff --git a/administrator/templates/atum/login.php b/administrator/templates/atum/login.php
index 3f043caabfc2..ded2802b62fa 100644
--- a/administrator/templates/atum/login.php
+++ b/administrator/templates/atum/login.php
@@ -102,9 +102,6 @@
             <?php echo Text::_('JGLOBAL_WARNJAVASCRIPT'); ?>
         </div>
     </noscript>
-    <div class="ie11 alert alert-warning" role="alert">
-        <?php echo Text::_('JGLOBAL_WARNIE'); ?>
-    </div>
 
     <header id="header" class="header d-flex">
         <div class="header-title d-flex">
diff --git a/api/language/en-GB/joomla.ini b/api/language/en-GB/joomla.ini
index 28099f5f552d..3301b8cff094 100644
--- a/api/language/en-GB/joomla.ini
+++ b/api/language/en-GB/joomla.ini
@@ -685,6 +685,7 @@ JGLOBAL_VOTES="Votes"
 JGLOBAL_VOTES_ASC="Votes ascending"
 JGLOBAL_VOTES_DESC="Votes descending"
 JGLOBAL_WARNCOOKIES="Warning! Cookies must be enabled to access the Administrator Backend."
+; @deprecated 5.0 will be removed in 6.0
 JGLOBAL_WARNIE="Warning! Internet Explorer should not be used for proper operation of the Administrator Backend."
 JGLOBAL_WARNJAVASCRIPT="Warning! JavaScript must be enabled for proper operation of the Administrator Backend."
 JGLOBAL_WIDTH="Width"
diff --git a/build/media_source/templates/administrator/atum/scss/blocks/_login.scss b/build/media_source/templates/administrator/atum/scss/blocks/_login.scss
index dd28e05015eb..2b7238927594 100644
--- a/build/media_source/templates/administrator/atum/scss/blocks/_login.scss
+++ b/build/media_source/templates/administrator/atum/scss/blocks/_login.scss
@@ -256,18 +256,6 @@ label {
   }
 }
 
-// Detect IE 10+ and display alert
-.ie11 {
-  display: none;
-}
-
-@media all and (-ms-high-contrast: none),
-  (-ms-high-contrast: active) {
-  .ie11 {
-    display: block;
-  }
-}
-
 .login_message {
   margin: 1rem 1rem 0;
 }