Internal: Set user locale on session when switching user

src/CoreBundle/EventSubscriber/SwitchUserSubscriber.php

@@ -0,0 +1,33 @@
+<?php
+
+/* For licensing terms, see /license.txt */
+
+declare(strict_types=1);
+
+namespace Chamilo\CoreBundle\EventSubscriber;
+
+use Chamilo\CoreBundle\Entity\User;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Security\Http\Event\SwitchUserEvent;
+
+class SwitchUserSubscriber implements EventSubscriberInterface
+{
+    public function onSecuritySwitchUser(SwitchUserEvent $event): void
+    {
+        $request = $event->getRequest();
+
+        if ($request->hasSession() && ($session = $request->getSession())) {
+            /** @var User $user */
+            $user = $event->getTargetUser();
+
+            $session->set('_locale_user', $user->getLocale());
+        }
+    }
+
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'security.switch_user' => 'onSecuritySwitchUser',
+        ];
+    }
+}