Remove jquery.i18n code that the ULS extension overrides

Instead of using the whole jquery.i18n code, use only required parts
that are not customized in MW ULS. For this define a new RL module
ext.uls.i18n.

Also refactor MW message store for jquery.i18n.

Change-Id: Idda9fe505428ade409d937314d7216ebb4232c36

lib/jquery.i18n/languages/hu.js

@@ -0,0 +1,26 @@
+/**
+ * Hungarian language functions
+ *
+ * @author Santhosh Thottingal
+ */
+( function ( $ ) {
+	'use strict';
+
+	$.i18n.languages.hu = $.extend( {}, $.i18n.languages['default'], {
+		convertGrammar: function ( word, form ) {
+			switch ( form ) {
+			case 'rol':
+				word += 'ról';
+				break;
+			case 'ba':
+				word += 'ba';
+				break;
+			case 'k':
+				word += 'k';
+				break;
+			}
+
+			return word;
+		}
+	} );
+}( jQuery ) );