Translations from JSON files are not working

[cedric-anne]

1. Translation from JSON files are not exposed in window.translations.
   I was able to expose them using this following piece of code in I18nServiceProvider::translations().

        $translations = $translations->merge(
            collect(File::files(resource_path('lang')))->filter(function ($file) {
                return $file->getExtension() === 'json';
            })->mapWithKeys(function ($file) {
                return [
                    basename($file->getFilenameWithoutExtension()) => collect(json_decode($file->getContents(), true)),
                ];
            })
        );

2. When exposing translations, thoose having a key containing a . are not working.