add locale middleware

app/Http/Middleware/LocaleMiddleware.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use App\UserSetting;
+use Closure;
+use Illuminate\Support\Facades\Session;
+
+class LocaleMiddleware
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+
+        if (empty(Session::get('locale'))) {
+            $userSetting = UserSetting::where('user_id', auth()->user()->id)->first();
+
+            $locale = 'en';
+            if (! in_array($userSetting->language, ['en', 'ru', 'est'])) {
+                $locale = $userSetting->language;
+            }
+            Session::put('locale', $locale);
+     
+            app()->setLocale($locale);
+
+            if (!empty($userSetting)) {
+                $userSetting->update([
+                    'language' => $locale
+                ]);
+            }
+        }
+
+        return $next($request);
+    }
+}