1. Let's add a new language Italy.
   Create an it.json file in the resources/lang/ folder. And refer to the other languages to add or update the keys and values for translation.
2. You need to add a new language in the topbar dropdown in the file resources/views/layouts/topbar.blade.php file and fin the class "language-switch". You can add a new language flag so it will be able to render in the topbar.
3. You can use {{ __('t-test') }} in the view.