public function translator_languages_pairs_filter($default, $user)
 {
     $result = $default;
     $user_id = $this->get_user_id($user);
     if (is_numeric($user_id)) {
         if ($this->blog_translators->is_translator($user_id)) {
             $result = $this->blog_translators->get_language_pairs($user_id);
         }
     }
     return $result;
 }