Datepicker: Update localization demo to use i18n files from ui folder

Author: arschmitz

demos/datepicker/datepicker-ar.js

@@ -6,7 +6,7 @@
 	<link rel="stylesheet" href="../../themes/base/all.css">
 	<link rel="stylesheet" href="../demos.css">
 	<script src="../../external/requirejs/require.js"></script>
-	<script src="../bootstrap.js" data-modules="datepicker-ar.js datepicker-fr.js datepicker-he.js datepicker-zh-TW.js">
+	<script src="../bootstrap.js" data-modules="i18n/datepicker-ar i18n/datepicker-fr i18n/datepicker-he i18n/datepicker-zh-TW">
 		$( "#datepicker" ).datepicker( $.datepicker.regional[ "fr" ] );
 		$( "#locale" ).on( "change", function() {
 			$( "#datepicker" ).datepicker( "option",