add language dropdown

app/Repos/System/Nova/NovaRepo.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Repos\System\Nova;
+
+use Closure;
+use Illuminate\Http\Request;
+use Laravel\Nova\Events\ServingNova;
+
+class NovaRepo
+{
+    /**
+     * Serving nova application
+     */
+    public static function serving(ServingNova $event): void
+    {
+        static::setLocale($event);
+    }
+
+    /**
+     * Set locales
+     */
+    public static function setLocale($event): void
+    {
+        $user = $event->request->user();
+
+        if (array_key_exists($user->locale, config('app.locales'))) {
+            app()->setLocale($user->locale);
+        }
+    }
+
+    /**
+     * Locale Switcher Save
+     */
+    public static function localeSwitcherSave(): Closure
+    {
+        return function (Request $request) {
+            $locale = $request->post('locale');
+
+            if (array_key_exists($locale, config('app.locales'))) {
+                $request->user()->update(['locale' => $locale]);
+            }
+        };
+    }
+}