Index: src/js/_enqueues/admin/common.js
===================================================================
--- src/js/_enqueues/admin/common.js	(revision 52779)
+++ src/js/_enqueues/admin/common.js	(working copy)
@@ -354,6 +354,21 @@
 window.setPostThumbnailL10n = deprecateL10nObject( 'setPostThumbnailL10n', window.setPostThumbnailL10n, '5.5.0' );
 
 /**
+ * Removed in 6.0.0, needed for back-compatibility.
+ *
+ * @since 4.5.0
+ * @deprecated 6.0.0
+ */
+window.uiAutocompleteL10n = window.uiAutocompleteL10n || {
+	noResults: '',
+	oneResult: '',
+	manyResults: '',
+	itemSelected: ''
+};
+
+window.uiAutocompleteL10n = deprecateL10nObject( 'uiAutocompleteL10n', window.uiAutocompleteL10n, '6.0.0' );
+
+/**
  * Removed in 3.3.0, needed for back-compatibility.
  *
  * @since 2.7.0
Index: src/js/_enqueues/admin/tags-suggest.js
===================================================================
--- src/js/_enqueues/admin/tags-suggest.js	(revision 52779)
+++ src/js/_enqueues/admin/tags-suggest.js	(working copy)
@@ -4,12 +4,11 @@
  * @output wp-admin/js/tags-suggest.js
  */
 ( function( $ ) {
-	if ( typeof window.uiAutocompleteL10n === 'undefined' ) {
-		return;
-	}
-
 	var tempID = 0;
 	var separator = wp.i18n._x( ',', 'tag delimiter' ) || ',';
+	var __ = wp.i18n.__,
+	    _n = wp.i18n._n,
+	    sprintf = wp.i18n.sprintf;
 
 	function split( val ) {
 		return val.split( new RegExp( separator + '\\s*' ) );
@@ -138,13 +137,13 @@
 				collision: 'none'
 			},
 			messages: {
-				noResults: window.uiAutocompleteL10n.noResults,
+				noResults: __( 'No results found.' ),
 				results: function( number ) {
-					if ( number > 1 ) {
-						return window.uiAutocompleteL10n.manyResults.replace( '%d', number );
-					}
-
-					return window.uiAutocompleteL10n.oneResult;
+					/* translators: %d: Number of results found when using jQuery UI Autocomplete. */
+					return sprintf( _n( '%d result found. Use up and down arrow keys to navigate.',
+							    '%d results found. Use up and down arrow keys to navigate.',
+							    number ),
+							number );
 				}
 			}
 		}, options );
Index: src/js/_enqueues/vendor/tinymce/plugins/wplink/plugin.js
===================================================================
--- src/js/_enqueues/vendor/tinymce/plugins/wplink/plugin.js	(revision 52779)
+++ src/js/_enqueues/vendor/tinymce/plugins/wplink/plugin.js	(working copy)
@@ -98,6 +98,9 @@
 		var urlRegex2 = /^https?:\/\/[^\/]+\.[^\/]+($|\/)/i;
 		var speak = ( typeof window.wp !== 'undefined' && window.wp.a11y && window.wp.a11y.speak ) ? window.wp.a11y.speak : function() {};
 		var hasLinkError = false;
+		var __ = window.wp.i18n.__;
+		var _n = window.wp.i18n._n;
+		var sprintf = window.wp.i18n.sprintf;
 
 		function getSelectedLink() {
 			var href, html,
@@ -457,15 +460,13 @@
 							my: 'left top+2'
 						},
 						messages: {
-							noResults: ( typeof window.uiAutocompleteL10n !== 'undefined' ) ? window.uiAutocompleteL10n.noResults : '',
+							noResults: __( 'No results found.' ) ,
 							results: function( number ) {
-								if ( typeof window.uiAutocompleteL10n !== 'undefined' ) {
-									if ( number > 1 ) {
-										return window.uiAutocompleteL10n.manyResults.replace( '%d', number );
-									}
-
-									return window.uiAutocompleteL10n.oneResult;
-								}
+								/* translators: %d: Number of results found when using jQuery UI Autocomplete. */
+								return sprintf( _n( '%d result found. Use up and down arrow keys to navigate.',
+										    '%d results found. Use up and down arrow keys to navigate.',
+										    number ),
+										number );
 							}
 						}
 					} ).autocomplete( 'instance' )._renderItem = function( ul, item ) {
Index: src/wp-includes/script-loader.php
===================================================================
--- src/wp-includes/script-loader.php	(revision 52779)
+++ src/wp-includes/script-loader.php	(working copy)
@@ -815,20 +815,6 @@
 	$scripts->add( 'jquery-ui-position', false, array( 'jquery-ui-core' ), '1.13.1', 1 );
 	$scripts->add( 'jquery-ui-widget', false, array( 'jquery-ui-core' ), '1.13.1', 1 );
 
-	// Strings for 'jquery-ui-autocomplete' live region messages.
-	did_action( 'init' ) && $scripts->localize(
-		'jquery-ui-autocomplete',
-		'uiAutocompleteL10n',
-		array(
-			'noResults'    => __( 'No results found.' ),
-			/* translators: Number of results found when using jQuery UI Autocomplete. */
-			'oneResult'    => __( '1 result found. Use up and down arrow keys to navigate.' ),
-			/* translators: %d: Number of results found when using jQuery UI Autocomplete. */
-			'manyResults'  => __( '%d results found. Use up and down arrow keys to navigate.' ),
-			'itemSelected' => __( 'Item selected.' ),
-		)
-	);
-
 	// Deprecated, not used in core, most functionality is included in jQuery 1.3.
 	$scripts->add( 'jquery-form', "/wp-includes/js/jquery/jquery.form$suffix.js", array( 'jquery' ), '4.3.0', 1 );
 
@@ -1119,7 +1105,8 @@
 
 	$scripts->add( 'admin-bar', "/wp-includes/js/admin-bar$suffix.js", array( 'hoverintent-js' ), false, 1 );
 
-	$scripts->add( 'wplink', "/wp-includes/js/wplink$suffix.js", array( 'jquery', 'wp-a11y' ), false, 1 );
+	$scripts->add( 'wplink', "/wp-includes/js/wplink$suffix.js", array( 'common', 'jquery', 'wp-a11y' ), false, 1 );
+	$scripts->set_translations( 'wplink' );
 	did_action( 'init' ) && $scripts->localize(
 		'wplink',
 		'wpLinkL10n',
@@ -1284,7 +1271,7 @@
 		$scripts->add( 'tags-box', "/wp-admin/js/tags-box$suffix.js", array( 'jquery', 'tags-suggest' ), false, 1 );
 		$scripts->set_translations( 'tags-box' );
 
-		$scripts->add( 'tags-suggest', "/wp-admin/js/tags-suggest$suffix.js", array( 'jquery-ui-autocomplete', 'wp-a11y' ), false, 1 );
+		$scripts->add( 'tags-suggest', "/wp-admin/js/tags-suggest$suffix.js", array( 'common', 'jquery-ui-autocomplete', 'wp-a11y' ), false, 1 );
 		$scripts->set_translations( 'tags-suggest' );
 
 		$scripts->add( 'post', "/wp-admin/js/post$suffix.js", array( 'suggest', 'wp-lists', 'postbox', 'tags-box', 'underscore', 'word-count', 'wp-a11y', 'wp-sanitize', 'clipboard' ), false, 1 );