Merge "When changing language first time, language code was shown"

resources/js/ext.uls.interface.js

@@ -163,6 +163,27 @@
 		} );
 	}
 
+	/**
+	 * Gets the name of the previously active language
+	 * @param {string} code Language code of previously selected language.
+	 * @return {jQuery.Promise}
+	 */
+	function getUndoAutonym( code ) {
+		var
+			deferred = $.Deferred(),
+			autonym = $.cookie( mw.uls.previousLanguageAutonymCookie );
+
+		if ( autonym ) {
+			deferred.resolve( autonym );
+		} else {
+			mw.loader.using( 'jquery.uls.data', function () {
+				deferred.resolve( $.uls.data.getAutonym( code ) );
+			} );
+		}
+
+		return deferred.promise();
+	}
+
 	/**
 	 * The tooltip to be shown when language changed using ULS.
 	 * It also allows to undo the language selection.
@@ -171,7 +192,6 @@
 		var ulsPosition = mw.config.get( 'wgULSPosition' ),
 			currentLang = mw.config.get( 'wgUserLanguage' ),
 			previousLang,
-			previousLanguageAutonym,
 			$ulsTrigger,
 			anonMode,
 			rtlPage = $( 'body' ).hasClass( 'rtl' ),
@@ -203,9 +223,7 @@
 			return;
 		}
 
-		previousLanguageAutonym = $.cookie( mw.uls.previousLanguageAutonymCookie ) ||
+		getUndoAutonym( previousLang ).done( function( autonym ) {
-			previousLang;
-
 			// Attach a tipsy tooltip to the trigger
 			$ulsTrigger.tipsy( {
 				gravity: tipsyGravity[ulsPosition],
@@ -216,7 +234,7 @@
 				title: function () {
 					var link;
 
-				link = $( '<a>' ).text( previousLanguageAutonym )
+					link = $( '<a>' ).text( autonym )
 						.attr( {
 							href: '#',
 							'class': 'uls-prevlang-link',
@@ -233,6 +251,7 @@
 					return mw.message( 'ext-uls-undo-language-tooltip-text', '$1' ).escaped().replace( '$1', link );
 				}
 			} );
+		} );
 
 		// Now that we set the previous languages,
 		// we can set the cookie of the previous autonym.