Add redirect from als to gsw

The 'als' is used in a non-standard way in MediaWiki -
it may be used to represent the Allemanic language,
the standard code of which is 'gsw', while 'als'
is ISO 639 3 refers to Tosk Albanian, which is
not currently used in any way in MediaWiki.
This local fix adds a redirect for it.

Also add a test to check that it works correctly.

Change-Id: Id904cab129eb58f8b96ce493e77d21da7c44ea8b

resources/js/ext.uls.init.js

@@ -139,6 +139,16 @@
 	$( document ).ready( function () {
 		var $ulsTrigger, previousLanguages, previousLang;
 
+		/*
+		 * The 'als' is used in a non-standard way in MediaWiki -
+		 * it may be used to represent the Allemanic language,
+		 * the standard code of which is 'gsw', while 'als'
+		 * is ISO 639 3 refers to Tosk Albanian, which is
+		 * not currently used in any way in MediaWiki.
+		 * This local fix adds a redirect for it.
+		 */
+		$.uls.data.addLanguage( 'als', { target: 'gsw' } );
+
 		// JavaScript side i18n initialization
 		i18nInit();
 

tests/qunit/ext.uls.tests.js

@@ -18,12 +18,21 @@
  */
 
 ( function ( $ ) {
-	"use strict";
+	'use strict';
 
-	module( "ext.uls", QUnit.newMwEnvironment() );
+	module( 'ext.uls', QUnit.newMwEnvironment() );
 
-	test( "-- Initial check", function () {
+	test( '-- Initial check', function () {
 		expect( 1 );
-		ok( $.fn.uls, "$.fn.uls is defined" );
+		ok( $.fn.uls, '$.fn.uls is defined' );
+	} );
+
+	test( '-- Custom langdb', function () {
+		expect( 1 );
+
+		// This is a custom non-standard language code used in MW.
+		// If it's not defined, then, for example,
+		// its direction cannot be acquired using the langdb utils.
+		strictEqual( $.uls.data.getDir( 'als' ), 'ltr', 'The direction of custom MW language als is ltr.' );
 	} );
 }( jQuery ) );