Index: src/js/_enqueues/admin/tags-suggest.js
===================================================================
--- src/js/_enqueues/admin/tags-suggest.js	(revision 46753)
+++ src/js/_enqueues/admin/tags-suggest.js	(working copy)
@@ -136,7 +136,7 @@
 				noResults: window.uiAutocompleteL10n.noResults,
 				results: function( number ) {
 					if ( number > 1 ) {
-						return window.uiAutocompleteL10n.manyResults.replace( '%d', number );
+						return window.uiAutocompleteL10n.manyResults;
 					}
 
 					return window.uiAutocompleteL10n.oneResult;
Index: src/js/_enqueues/vendor/tinymce/plugins/wplink/plugin.js
===================================================================
--- src/js/_enqueues/vendor/tinymce/plugins/wplink/plugin.js	(revision 46753)
+++ src/js/_enqueues/vendor/tinymce/plugins/wplink/plugin.js	(working copy)
@@ -461,7 +461,7 @@
 							results: function( number ) {
 								if ( typeof window.uiAutocompleteL10n !== 'undefined' ) {
 									if ( number > 1 ) {
-										return window.uiAutocompleteL10n.manyResults.replace( '%d', number );
+										return window.uiAutocompleteL10n.manyResults;
 									}
 
 									return window.uiAutocompleteL10n.oneResult;
Index: src/wp-includes/script-loader.php
===================================================================
--- src/wp-includes/script-loader.php	(revision 46753)
+++ src/wp-includes/script-loader.php	(working copy)
@@ -1172,10 +1172,8 @@
 		'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.' ),
+			'manyResults' => _n( '%d result found. Use up and down arrow keys to navigate.', '%d results found. Use up and down arrow keys to navigate.', did_action( 'init' ) ),
 			'itemSelected' => __( 'Item selected.' ),
 		)
 	);