protected function _files($category, $locale, $scope)
{
$files = parent::_files($category, $locale, $scope);
foreach ($files as $key => $file) {
$extension = pathinfo($file, PATHINFO_EXTENSION);
if (!$this->mo && $extension === 'mo' || !$this->po && $extension === 'po') {
unset($files[$key]);
}
}
return $files;
}