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/ru.js

@@ -0,0 +1,33 @@
+/**
+ * Russian (Русский) language functions
+ */
+
+( function ( $ ) {
+	'use strict';
+
+	$.i18n.languages.ru = $.extend( {}, $.i18n.languages['default'], {
+		convertGrammar: function ( word, form ) {
+			if ( form === 'genitive' ) { // родительный падеж
+				if ( ( word.substr( word.length - 4 ) === 'вики' ) ||
+					( word.substr( word.length - 4 ) === 'Вики' )
+				) {
+					// ...
+				} else if ( word.substr( word.length - 1 ) === 'ь' ) {
+					word = word.substr( 0, word.length - 1 ) + 'я';
+				} else if ( word.substr( word.length - 2 ) === 'ия' ) {
+					word = word.substr( 0, word.length - 2 ) + 'ии';
+				} else if ( word.substr( word.length - 2 ) === 'ка' ) {
+					word = word.substr( 0, word.length - 2 ) + 'ки';
+				} else if ( word.substr( word.length - 2 ) === 'ти' ) {
+					word = word.substr( 0, word.length - 2 ) + 'тей';
+				} else if ( word.substr( word.length - 2 ) === 'ды' ) {
+					word = word.substr( 0, word.length - 2 ) + 'дов';
+				} else if ( word.substr( word.length - 3 ) === 'ник' ) {
+					word = word.substr( 0, word.length - 3 ) + 'ника';
+				}
+			}
+
+			return word;
+		}
+	} );
+}( jQuery ) );