I'm having a problem to build a translation switcher, this is what I have already did:

Step 1 : I have prefixed all the routes with the locale parameter {languge}

Route::redirect('/', '/en');

Route::group(['prefix' => '{language}'], function () {
            //products routes
                    Route::get('/',  'ProductController@index' )->name('acceuil');
                    Route::get('/boutique/{slug}',  'ProductController@show' )->name('product.show');
                    Route::get('/search',  'ProductController@search' )->name('product.search');

              });
              

step 2: then I created a middleware for setting the language of app depending on the request

 public function handle($request, Closure $next)
    {
        App::setLocale($request->language);
        return $next($request);
    }

step 3: here I added Locale parameter {languge} to All Existing Links, like this:

<form method="POST" action="{{ route('register', app()->getLocale()) }}">

right here everything is fine but:

here I want to create a language switcher, this is what I did:

step 4: here I added Locale parameter {languge}to All Existing Links, like this:

<ul class="nav navbar-nav navbar-right">
                                <li class="dropdown">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">{{ _('language')  }}<span class="caret"></span></a>
                                    <ul class="dropdown-menu">
                                    <li><a href="{{ route(  Route::currentRouteName(), 'fr' ) }}">{{ _('Francais') }}</a></li>
                                    <li role="separator" class="divider"></li>
                                    <li><a  href="{{ route(  Route::currentRouteName(), 'en' ) }}">{{ _('anglais')  }}</a></li>  
                                    
                                    </ul>
                                </li>
                            </ul> 

              

The problem is that I have different routes, some of them require a parameters and then Step 4 doesn't work:

ANY ideas ?