das marketing frontend wurde auf lokalisierte urls umgestellt.

app/Http/Middleware/SetLocaleFromRequest.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\App;
+use Illuminate\Support\Facades\Session;
+
+class SetLocaleFromRequest
+{
+    public function handle(Request $request, Closure $next)
+    {
+        $supportedLocales = $this->supportedLocales();
+
+        $locale = (string) $request->route('locale');
+
+        if (! $locale || ! in_array($locale, $supportedLocales, true)) {
+            $preferred = Session::get('preferred_locale');
+
+            if ($preferred && in_array($preferred, $supportedLocales, true)) {
+                App::setLocale($preferred);
+                Session::put('locale', $preferred);
+                $request->attributes->set('preferred_locale', $preferred);
+            }
+
+            return $next($request);
+        }
+
+        App::setLocale($locale);
+        Session::put('preferred_locale', $locale);
+        Session::put('locale', $locale);
+        $request->attributes->set('preferred_locale', $locale);
+
+        return $next($request);
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    private function supportedLocales(): array
+    {
+        $configured = array_filter(array_map(
+            static fn ($value) => trim((string) $value),
+            explode(',', (string) env('APP_SUPPORTED_LOCALES', ''))
+        ));
+
+        if (empty($configured)) {
+            $configured = array_filter([
+                config('app.locale'),
+                config('app.fallback_locale'),
+            ]);
+        }
+
+        if (empty($configured)) {
+            $configured = ['de', 'en'];
+        }
+
+        return array_values(array_unique($configured));
+    }
+}