Lazy loading of regions

Also adds landing page feature. But candidate list is hardcoded
for now. Example html file updated.

show method of lcd renamed to render.

Introduced a trigger searchclear
Introduced mw.uls.changeLanguage, setPreviousLanguages
getPreviousLanguages and getBrowserLanguage methods

Region groups re-numbered - from [4, 1, 2, 3] to [1, 2, 3, 4].

Change-Id: Iac1edf628708e6f40e41578df70d40c42f15289a

resources/js/ext.uls.displaysettings.js

@@ -323,19 +323,6 @@
 			this.$parent.hide();
 		},
 
-		/**
-		 * Change the language of wiki using setlang URL parameter
-		 * @param {String} language
-		 */
-		changeLanguage: function ( language ) {
-			$.cookie( 'uls-previous-language', this.getUILanguage() );
-			var uri = new mw.Uri( window.location.href );
-			uri.extend( {
-				setlang: language
-			} );
-			window.location.href = uri.toString();
-		},
-
 		/**
 		 * Callback for save preferences
 		 */
@@ -346,7 +333,7 @@
 				this.$parent.hide();
 				// we delay change UI language to here, because it causes a page refresh
 				if ( this.uiLanguage !== this.getUILanguage() ) {
-					this.changeLanguage( this.uiLanguage );
+					mw.uls.changeLanguage( this.uiLanguage );
 				}
 			} else {
 				// FIXME failure. what to do?!