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/fi.js

@@ -0,0 +1,49 @@
+/**
+ * Finnish (Suomi) language functions
+ *
+ * @author Santhosh Thottingal
+ */
+
+( function ( $ ) {
+	'use strict';
+
+	$.i18n.languages.fi = $.extend( {}, $.i18n.languages['default'], {
+		convertGrammar: function ( word, form ) {
+			// vowel harmony flag
+			var aou = word.match( /[aou][^äöy]*$/i ),
+				origWord = word;
+			if ( word.match( /wiki$/i ) ) {
+				aou = false;
+			}
+
+			// append i after final consonant
+			if ( word.match( /[bcdfghjklmnpqrstvwxz]$/i ) ) {
+				word += 'i';
+			}
+
+			switch ( form ) {
+			case 'genitive':
+				word += 'n';
+				break;
+			case 'elative':
+				word += ( aou ? 'sta' : 'stä' );
+				break;
+			case 'partitive':
+				word += ( aou ? 'a' : 'ä' );
+				break;
+			case 'illative':
+				// Double the last letter and add 'n'
+				word += word.substr( word.length - 1 ) + 'n';
+				break;
+			case 'inessive':
+				word += ( aou ? 'ssa' : 'ssä' );
+				break;
+			default:
+				word = origWord;
+				break;
+			}
+
+			return word;
+		}
+	} );
+}( jQuery ) );