Fix bug: language stuck in English

Change-Id: Ice51d517f5381197f9c0f72844961e74b021e3dc

UniversalLanguageSelector.hooks.php

@@ -74,15 +74,16 @@ class UniversalLanguageSelectorHooks {
 			// uselang can be used for temporary override of language preference
 			return true;
 		}
+
 		$setlang = $wgRequest->getVal( 'setlang' );
-		$setlang = RequestContext::sanitizeLangCode( $setlang );
+		if ( $setlang ) {
 			// TODO: replace with core method once one exists
 			$supported = Language::fetchLanguageNames( null, 'mwfile' );
-		if ( !array_key_exists( $setlang, $supported ) ) {
+			if ( !isset( $supported[$setlang] ) ) {
 				wfDebug( "Invalid user language code\n" );
 				return true;
 			}
-		if ( $setlang ) {
+
 			if ( $user->isAnon() ) {
 				$wgRequest->response()->setcookie( 'language', $setlang );
 			} else {