Using symfonys getPreferendLanguage

Http/routes.php

@@ -5,9 +5,10 @@
 | Language Settings
 |--------------------------------------------------------------------------
 */
+$lang = Request::getPreferredLanguage(['fr', 'en', 'en', 'de']);
+
 if (App::environment() == 'testing') {
-    $_SERVER['HTTP_ACCEPT_LANGUAGE'] = 'fr_FR';
+    $lang = 'fr';
 }
-$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
 
 App::setLocale('fr');
\ No newline at end of file