Laravel - Read language files and put them into an array

I'm using laravel 5.2 with locale. I have a function that reads all my language files and put them into an array:

$this->langPath = resource_path('lang/'.App::getLocale());
$allTranslations = collect(File::allFiles($this->langPath))->flatMap(function ($file) {
    return [
        ($translation = $file->getBasename('.php')) => trans($translation),
    ];
});

This works fine. But the subfolder of my lang folder are missing of course. So I added another file read on the subfolder. But it returns only the name of the files and not the content:

$allModuleTranslations = collect(File::allFiles($this->langPath .'/modul'))->flatMap(function ($file) {
    return [
        ($translation = $file->getBasename('.php')) => trans($translation),
    ];
});

This turns out only the name of the files i.e. general, module1 and not the content of these files. What I'm doing wrong here? This is the folder structure:

[lang]
   [de]
      someFile.php
      anotherFile.php
      [modul]
         general.php
         modul1.php
   [en]
      someFile.php
      anotherFile.php
      [modul]
         general.php
         modul1.php

Thanks in advance for any help!

via Chebli Mohamed