Update jquery.i18n from upstream

Upstream: https://github.com/wikimedia/jquery.i18n
Upstream changes:
* Fixed a potential js error because of wrong logic
* Fixed some JShint errors
* Added license and credits files
* Updated gitignore file
* Fixed uk and ru grammar rules and updating tests
* Source code formatting updates

Change-Id: I43433cc3d9993045160dc85ed9e73370d22794cf

lib/jquery.i18n/jquery.i18n.fallbacks.js

@@ -15,7 +15,7 @@
 	'use strict';
 
 	$.i18n = $.i18n || {};
-	$.i18n.fallbacks = {
+	$.extend( $.i18n.fallbacks, {
 		'ab': ['ru'],
 		'ace': ['id'],
 		'aln': ['sq'],
@@ -182,5 +182,5 @@
 		'zh-sg': ['zh-hans'],
 		'zh-tw': ['zh-hant', 'zh-hans'],
 		'zh-yue': ['yue']
-	};
+	} );
 }( jQuery ) );