/**
  * @param ContentInterface $about
  * @param PosterInterface  $viewer
  *
  * @return string
  */
 public function getPrivacyLabel(ContentInterface $about, PosterInterface $viewer = null)
 {
     $isOwner = false;
     /**
      * Is poster of content
      */
     if ($about->viewerIsParent()) {
         $isOwner = true;
     }
     $relationType = $about->getPrivacyType();
     $parentType = $about->getParentType();
     if ($relationType < RELATION_TYPE_CUSTOM) {
         switch ($relationType) {
             case RELATION_TYPE_ANYONE:
                 $msgId = 'relation.privacy_label_public';
                 break;
             case RELATION_TYPE_OWNER:
                 $msgId = 'relation.' . $parentType . '_privacy_label_owner';
                 break;
             case RELATION_TYPE_MEMBER_OF_MEMBER:
                 $msgId = 'relation.' . $parentType . '_privacy_label_member_of_members';
                 break;
             case RELATION_TYPE_ADMIN:
                 $msgId = 'relation.' . $parentType . '_privacy_label_admin';
                 break;
             case RELATION_TYPE_EDITOR:
                 $msgId = 'relation.' . $parentType . '_privacy_label_editor';
                 break;
             case RELATION_TYPE_MEMBER:
                 $msgId = 'relation.' . $parentType . '_privacy_label_member';
                 break;
             case RELATION_TYPE_REGISTERED:
                 $msgId = 'relation.' . $parentType . '_privacy_label_registered';
                 break;
             default:
                 $msgId = 'relation.' . $parentType . '_privacy_label_custom';
         }
     }
     if (empty($msgId)) {
         $relationId = $about->getPrivacyValue();
         $item = $this->findById($relationId);
         if ($item) {
             $msgId = $item->getRelationTitle();
         }
     }
     if (empty($msgId)) {
         $msgId = 'relation.' . $about->getParentType() . '_privacy_label_custom';
     }
     /**
      *
      */
     $parent = $about->getParent();
     if ($isOwner) {
         return app()->text($msgId, ['$parent\'s' => 'Your', '$parent' => 'You']);
     }
     $label = $parent->getTitle();
     return app()->text($msgId, ['$parent' => $label]);
 }