public function untranslated($locale, $perPage = 0, $text = null)
    {
        $ids = $this->untranslatedQuery($locale)->pluck('id');

        $untranslated = $text ? $this->model->whereIn('id', $ids)->where('text', 'like', "%$text%") : $this->model->whereIn('id', $ids);

        return $perPage ? $untranslated->paginate($perPage) : $untranslated->get();
    }