You have to add "alias" in two places:
Line 21:
var $placeHolders = array(
'rowLevel' => array('[+wf.wrapper+]','[+wf.classes+]','[+wf.classnames+]','[+wf.link+]','[+wf.title+]','[+wf.linktext+]','[+wf.id+]','[+wf.alias+]','[+wf.attributes+]','[+wf.docid+]','[+wf.introtext+]','[+wf.description+]','[+wf.subitemcount+]'),
'wrapperLevel' => array('[+wf.wrapper+]','[+wf.classes+]','[+wf.classnames+]'),
'tvs' => array(),
);
In ’rowLevel’
Line 182:
$phArray = array($useSub,$useClass,$classNames,$resource['link'],$resource['title'],$resource['linktext'],$useId,$resource['alias'],$resource['link_attributes'],$resource['id'],$resource['introtext'],$resource['description'],$numChildren);
It works