public function getDescription($attachmentId)
{
$em = $this->getEntityManager();
$attachment = $em->getRepository('Newscoop\\Entity\\Attachment')->findOneById($attachmentId);
$description = $em->getRepository('Newscoop\\Entity\\Translation')->findBy(array('phraseId' => $attachment->getDescriptionId(), 'language' => $attachment->getLanguage()));
return $description;
}