$lang = $this->getRequest()->getRawVal( 'lang', '' );
// Stricter version of RequestContext::sanitizeLangCode()
if ( !Language::isValidBuiltInCode( $lang ) ) {
$lang = $this->getRequest()->getRawVal( 'lang', '' );
// Stricter version of RequestContext::sanitizeLangCode()
if ( !Language::isValidBuiltInCode( $lang ) ) {