Laravel 5.2: Create multilang site (Session+Middleware)

Hello,

How to create a multi-language site in Laravel 5.2:

config/app.php

'locale' => 'ca',
'locales' => ['ca' => 'Català', 'es' => 'Español', 'en' => 'English'],

app/Http/routes.php

Route::group(['middleware' => ['web']], function () {
    Route::get('/', [
        'as' => 'underconstruction', 'uses' => 'Underconstruction\UnderconstructionController@showIndex'
    ]);
    Route::get('/lang/{langcode?}', function ($langcode = 'ca') {
        return redirect()->route('underconstruction');
    });
});

app/Http/Kernel.php

/**
     * The application's route middleware groups.
     *
     * @var array
     */
    protected $middlewareGroups = [
        'web' => [
            \App\Http\Middleware\EncryptCookies::class,
            \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
            \Illuminate\Session\Middleware\StartSession::class,
            \Illuminate\View\Middleware\ShareErrorsFromSession::class,
            \App\Http\Middleware\VerifyCsrfToken::class,
            \App\Http\Middleware\LangMiddleware::class,
        ],

        'api' => [
            'throttle:60,1',
        ],
    ];

/app/Http/Middleware/LangMiddleware.php

<?php

namespace App\Http\Middleware;

use Closure;
use App;

class LangMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $lang = $request->segment(1);
        $locale = $request->segment(2);

        if ($lang == 'lang' && array_key_exists($locale, app()->config->get('app.locales'))) {
            $request->session()->put('locale', $locale);
        } else if ($request->session()->has('locale')) {
            App::setLocale($request->session()->get('locale'));
        }

        return $next($request);
    }
}

/app/Http/Controllers/Underconstruction/UnderconstructionController.php

<?php

namespace App\Http\Controllers\Underconstruction;

use App\Http\Controllers\Controller as Controller;

class UnderconstructionController extends Controller
{
    public function showIndex() {
        return app()->getLocale();
    }
}

If you access to http://yourweb/ --> lang = ca
if you access to http://yourweb/lang/es --> lang = es
If you access to http://yourweb/ --> lang =es

Lang is saved in session data.

Best regards,
Iban Cardona.