Implement dual license GPLv2 and MIT.

Should only be merged after +1 by all current contributors that are added as
reviewers.

Change-Id: Ie0480019524fa7b45ec6635d92b63e8b7880a2a0

UniversalLanguageSelector.php

@@ -1,13 +1,21 @@
 <?php
 /**
- * Universal Language Selector extension
- * https://www.mediawiki.org/wiki/Universal_Language_Selector
+ * Initialisation file for MediaWiki extension UniversalLanguageSelector.
+ *
+ * Copyright (C) 2012 Alolita Sharma, Amir Aharoni, Arun Ganesh, Brandon Harris,
+ * Niklas Laxström, Pau Giner, Santhosh Thottingal, Siebrand Mazeland and other
+ * contributors. See CREDITS for a list.
+ *
+ * UniversalLanguageSelector is dual licensed GPLv2 or later and MIT. You don’t
+ * have to do anything special to choose one license or the other and you don’t
+ * have to notify anyone which license you are using. You are free to use
+ * UniversalLanguageSelector in commercial projects as long as the copyright
+ * header is left intact. See files GPL-LICENSE and MIT-LICENSE for details.
  *
  * @file
  * @ingroup Extensions
- * @author Santhosh Thottingal
- * @copyright © 2012 Santhosh Thottingal
- * @licence GNU General Public Licence 3.0 or later
+ * @licence GNU General Public Licence 2.0 or later
+ * @licence MIT License
  */
 
 if ( !defined( 'MEDIAWIKI' ) ) {