Laravel - Read all available languages, but all translations are German

I have a Service Provider in laravel which reads all available languages from locale and save them in a Cache file. Everything works fine, but all translations are in German. I expect to get them in language de and en. This is the code from the ServiceProvider:

$minutes = 24*60;
Cache::remember('translations', $minutes, function () {
$directories = array('de','en');
$collection = new \stdClass;
foreach($directories as $directory)
{
    $path = resource_path('lang/' .$directory);
    $allTranslations = collect(File::allFiles($path))->flatMap(function ($file,$directory) {
        return [
            ($translation = $file->getBasename('.php')) => trans($translation,array(),null,$directory),
        ];
    });
    $allModuleTranslations = collect(File::allFiles($path .'/modul'))->flatMap(function ($file,$directory) {
        return [
            ($translation = $file->getBasename('.php')) => trans('modul/' .$translation,array(),null,$directory),
        ];
    });
    $collection->$directory = $allTranslations->merge($allModuleTranslations);
}
return json_encode($collection);

Can anybody see, why it returns all words in German?

The result looks like this:

{
   de:
      auth:
         failed: "Diese Zugangsdaten wurden nicht in unserer Datenbank gefunden."
         throttle: "Zu viele Login Versuche. Versuchen Sie es bitte in :seconds Sekunden."
   en:
      auth:
         failed: "Diese Zugangsdaten wurden nicht in unserer Datenbank gefunden."
         throttle: "Zu viele Login Versuche. Versuchen Sie es bitte in :seconds Sekunden."
}

via Chebli Mohamed