/**
  * Makes additional translation of $entity $field into $locale
  * using $value
  *
  * @param object $entity
  * @param string $field
  * @param string $locale
  * @param mixed $value
  * @return TranslationRepository
  */
 public function translate($entity, $field, $locale, $value)
 {
     $meta = $this->_em->getClassMetadata(get_class($entity));
     $config = $this->getTranslationListener()->getConfiguration($this->_em, $meta->name);
     if (!isset($config['fields']) || !in_array($field, $config['fields'])) {
         throw new \Gedmo\Exception\InvalidArgumentException("Entity: {$meta->name} does not translate - {$field}");
     }
     $oid = spl_object_hash($entity);
     $this->listener->addTranslation($oid, $field, $locale, $value);
     return $this;
 }