Laravel implementing simple MiddleWare doesn't work - laravel

Question

In my web application i'm trying to check local in URLs, for example:
In this URL as http://www.sample.com/aboutUs we don't have any locale such as en,ru or etc like: http://www.sample.com/en/aboutUs.
In my web app I implemented simple middleware to check that and fix URL when URLs don't have them:
class language
{
public function handle($request, Closure $next)
{
dd($request);
$locale = $request->segment(1);
if (!array_key_exists($locale, config('app.locales'))) {
$segments = $request->segments();
$segments[0] = config('app.fallback_locale');
return redirect(implode('/', $segments));
}
app()->setLocale($locale);
return $next($request);
}
}
Which that registered into:
protected $middlewareGroups = [
'web' => [
\App\Http\Middleware\Language::class,
...
],
'api' => [
'throttle:60,1',
'bindings',
],
];
protected $routeMiddleware = [
'language' => \App\Http\Middleware\Language::class,
...
];
This middleware only work when we have locale in URL and my code as:
Route::get('/showContent/aboutUs', ['middleware' => 'language', function()
{
dd('asda');
//
}]);
This doesn't work and I don't see any dd output
1:
Route::group(['middleware' => 'web'], function () {
Route::get('/showContent/aboutUs', 'HomeController#aboutUs');
});
2:
Route::group(['middleware' => 'language'], function () {
Route::get('/showContent/aboutUs', 'HomeController#aboutUs');
});
for all my solutions i get this output:
Sorry, the page you are looking for could not be found.