fix code quality, typage, php-csfixer

src/Controller/LocaleController.php

@@ -4,6 +4,7 @@ namespace App\Controller;
 
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
+use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Routing\Annotation\Route;
 
@@ -17,7 +18,7 @@ class LocaleController extends AbstractController
     }
 
     #[Route(path: 'locale/{locale?}', name: 'locale_change')]
-    public function changeLocal(?string $locale, Request $request)
+    public function changeLocal(?string $locale, Request $request): RedirectResponse
     {
         if (empty($locale)) {
             $locale = $this->params->get('default_locale');