🌐 Add Portuguese and Dutch language translations

- Introduced `lang/pt` and `lang/nl` directories with translations for `auth.php`, `pagination.php`, `passwords.php`, and `validation.php`.
- Extended existing Spanish (`es.json`) and German (`de.json`) translations with additional keys and values.
- Integrated Laravel Nightwatch package for enhanced language coverage and insights.
- Updated `composer.json` and `composer.lock` to include the new package.

lang/pt/auth.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+    'failed'   => 'As credenciais indicadas não coincidem com as registadas no sistema.',
+    'password' => 'A palavra-passe está errada.',
+    'throttle' => 'O número limite de tentativas de login foi atingido. Por favor tente novamente dentro de :seconds segundos.',
+];