Localization without route prefix doesn't work - laravel

Question

I'm using the Laravel docs to implement localization (without the prefix in the url).
Basically I want two links "EN" and "NL". Depending on which link I click, the locale should be changed to that specific language.
I use this links:
NL
EN
This route:
Route::get('language/{locale}', 'HomeController#setLang');
And this is my HomeController:
class HomeController extends Controller
{
public function setLang($locale){
App::setLocale($locale);
return back();
}
}
I set my files in resources/lang the way it's explained in the docs.
But, the output ( {{ trans('messages.welcome') }} ) isn't translated.
What am I doing wrong? :)
UPDATE
{{ trans('header.register') }}
Routes
Route::group(['middleware' => ['language']], function () {
//
Route::get('language/{locale}', 'HomeController#setLang');
});
Lang file:
return [
'register' => 'REGISTREER',
];
My Kernel.php
protected $routeMiddleware = [
'auth' => \App\Http\Middleware\Authenticate::class,
'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
'language' => \App\Http\Middleware\Language::class,
];

Answer 1

If you don't want to prefix the urls, you could use the session in conjunction with a middleware.
All you need is a controller and a middleware.
App\Http\Controllers\HomeController method:
class HomeController extends Controller
{
public function setLang($locale)
{
// 1. store selected locale
Session::put('my_project.locale', $locale);
return back();
}
}
App\Http\LocaleMiddleware method:
class LocaleMiddleware
{
public function handle($request, Closure $next)
{
$default = config('app.locale');
// 2. retrieve selected locale if exist (otherwise return the default)
$locale = Session::get('my_project.locale', $default);
// 3. set the locale
App::setLocale($locale);
return $next($request);
}
}
Do not forget to register the middleware globally.