A new middleware UserLocale.php has been added. This middleware sets the language locale based on each user's preference. It operates by checking if the user's preferred language is set during the request cycle and if so, it changes the app's locale accordingly. This feature facilitates personalization by displaying the app in a user's preferred language.

Also, registering the middleware in the `Kernel.php` allows it to be used throughout the application

app/Http/Kernel.php

@@ -63,5 +63,6 @@ class Kernel extends HttpKernel
         'signed' => \App\Http\Middleware\ValidateSignature::class,
         'throttle' => \Illuminate\Routing\Middleware\ThrottleRequestsWithRedis::class,
         'verified' => \App\Http\Middleware\EnsureUserIsVerified::class,
+        'user.locale' => \App\Http\Middleware\UserLocale::class,
     ];
 }

app/Http/Middleware/UserLocale.php

@@ -0,0 +1,19 @@
+<?php declare(strict_types=1);
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\App;
+
+final class UserLocale
+{
+    public function handle(Request $request, Closure $next)
+    {
+        if ($request->user() && $request->user()->lang) {
+            App::setLocale($request->user()->lang->getLocale());
+        }
+
+        return $next($request);
+    }
+}