Laravel Gettext Error Class 'App\Http\Controllers\LaravelGettext' not found

I followed these steps for installing Gettext with laravel

http://ift.tt/2ndZWwn

However, I am getting Class 'App\Http\Controllers\LaravelGettext' not found error.

If I include the namespace with classes, it says, that the method is not defined as static, which is true after checking the code.

Am I missing something?

Error place (copied from the gettext plugin page)

public function changeLang($locale=null) {

    LaravelGettext::setLocale($locale);
    return Redirect::to(URL::previous());
}

via Chebli Mohamed