Laravel 8 route() does not localize strings - laravel

Question

EDIT: found the answer to all my questions: https://github.com/codezero-be/laravel-localized-routes (and, of course, 42).
I'm working on a multi-language website where the URL's contain localized strings. For instance:
https://site/en/members/john-doe
https://site/nl/leden/john-doe
(and so for every language)
In web.php, I prefixed my routes. Via middleware, I set the current language (retrieved from the first URL-segment). This works fine for everything (both in controllers and in blade)... except for the URLs generated by route(). They are always in the default language. Even though everything else is correctly localized. If I dump app()->getLocale() in a controller of blade it shows the correct language. Only the URLs generated by the route()-function are always in the default fallback language.
I've tried moving my middleware-class higher up in the middleware-groups list. That didn't make a difference.
web.php
Route::prefix('{lang}')->group(function() {
Route::get(trans('routes.members') . '/{username}/', 'MembersController#profile')
->name('members.show');
}
SetLanguage middleware
...
public function handle(Request $request, Closure $next)
{
$lang = $request->segment(1) ?? app()->getLocale();
//set app language
app()->setLocale($lang);
//set default url parameter
URL::defaults(['lang' => $lang]);
return $next($request);
}
...
App\Http\Kernel.php
...
protected $middlewareGroups = [
'web' => [
\App\Http\Middleware\EncryptCookies::class,
\Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
\Illuminate\Session\Middleware\StartSession::class,
\Laravel\Jetstream\Http\Middleware\AuthenticateSession::class,
\Illuminate\View\Middleware\ShareErrorsFromSession::class,
\App\Http\Middleware\VerifyCsrfToken::class,
\App\Http\Middleware\SetLanguage::class,
\Illuminate\Routing\Middleware\SubstituteBindings::class,
\App\Http\Middleware\UserLastSeenAt::class,
],
...

Answer 1

Got it (with a little help from a friend)
In the AppServiceProvider's boot function I've added
public function boot(Request $request)
{
//set app language
app()->setLocale($request->segment(1) ?? app()->getLocale());
}
& the SetLanguage-middleware now only contains
public function handle(Request $request, Closure $next)
{
//set default url parameter
URL::defaults(['lang' => app()->getLocale()]);
return $next($request);
}
That did the trick!

Answer 2

Great! I've done the same as you, but i have a problem when i chose to change the lang from switcher.
The switcher in blade:
<a class="ml-1 underline ml-2 mr-2" href="{{ route('change-lang')}}">
<span>{{ $locale_name }}</span>
</a>
The target route:
Route::get('/lang', [LangController::class, 'changeLang'])->name('change-lang');
The function in LangController:
public function changeLang($locale){
App::setLocale($locale);
session()->put('locale', $locale);
return redirect()->back();
}
Let me Exaplain:
If i navigate, for example, in about section and my url is "webname/it/azienda" and i switch language in EN my url becomes "webname/it/en";
I don't have issues if i change language if I have "webname/azienda" or "/" for home page.
I cannot change only the parameters LOCALE without adding it.