Adding localisation to the laravel 5

First, create a new controller "LanguageController". You can use this command : php artisan make:controller LanguageController

namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use App\Http\Requests;
use Config;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Redirect;
use Illuminate\Support\Facades\Session;

class LanguageController extends Controller {

    public function switchLang($lang)
     {
        if (array_key_exists($lang, Config::get('languages'))) {
            Session::set('applocale', $lang);
        }
        return Redirect::back();
     }
}

Ok, as you see we use a custom config array to fetch the available languages of the app, so lets create a languages.php in the config/ directory :

return [
    'en' => 'English',
    'fr' => 'Français',
];

Good! Now to use our controller, we are going to set up one new route:

Route::get('lang/{lang}', ['as'=>'lang.switch', 'uses'=>'LanguageController@switchLang']);

You should now be able to use a Language dropdown (I often put it in my navbar). Check this example based on boostrap dropdown :

<li class="dropdown">
    <a href="#" class="dropdown-toggle" data-toggle="dropdown">
        {{ Config::get('languages')[App::getLocale()] }}
    </a>
    <ul class="dropdown-menu">
        @foreach (Config::get('languages') as $lang => $language)
            @if ($lang != App::getLocale())
                <li>
                    {!! link_to_route('lang.switch', $language, $lang) !!}
                </li>
            @endif
        @endforeach
    </ul>
</li>

Last thing to do is to set up a new Middleware:

// app/Http/Middleware/Language.php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Contracts\Routing\Middleware;
use Illuminate\Foundation\Application;
use Illuminate\Http\Request;
use Illuminate\Routing\Redirector;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Config;
use Illuminate\Support\Facades\Session;

class Language implements Middleware {
    public function handle($request, Closure $next)
    {
        if (Session::has('applocale') AND array_key_exists(Session::get('applocale'), Config::get('languages'))) {
            App::setLocale(Session::get('applocale'));
        }
        else { // This is optional as Laravel will automatically set the fallback language if there is none specified
            App::setLocale(Config::get('app.fallback_locale'));
        }
        return $next($request);
    }
}

And of course we do not forget to update Kernel.php with our new Middleware (check the order I use)

protected $middleware = [
    'Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode',
    'Illuminate\Cookie\Middleware\EncryptCookies',
    'Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse',
    'Illuminate\Session\Middleware\StartSession',
    'App\Http\Middleware\Language',
    'Illuminate\View\Middleware\ShareErrorsFromSession',
    'App\Http\Middleware\VerifyCsrfToken',
];