public function getTranslatableTopics($locale, $order = 'asc')
{
$query = $this->getQueryBuilder()->select('node', 't')->from('Newscoop\\NewscoopBundle\\Entity\\Topic', 'node')->leftJoin('node.translations', 't')->where("t.field = 'title'");
$query = $query->orderBy('node.root, node.lft', $order)->getQuery();
return $this->setTranslatableHint($query, $locale);
}