Stand: SMTP-Test, Admin-Mail-Tab, Notifiable-Fix, Lazy-Quill

- Fix: Notifiable-Trait zum User-Model hinzugefuegt (behebt notify()-500er)
- Installer: SMTP-Verbindungstest mit EsmtpTransport + Ueberspringen-Link
- Admin: Neuer E-Mail-Tab mit SMTP-Konfiguration + Verbindungstest
- Admin: Lazy Quill-Initialisierung (nur sichtbare Locale wird geladen)
- Uebersetzungen: 17 neue Mail-Keys in allen 6 Sprachen

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vendor/symfony/translation/README.md

@@ -0,0 +1,40 @@
+Translation Component
+=====================
+
+The Translation component provides tools to internationalize your application.
+
+Getting Started
+---------------
+
+```bash
+composer require symfony/translation
+```
+
+```php
+use Symfony\Component\Translation\Translator;
+use Symfony\Component\Translation\Loader\ArrayLoader;
+
+$translator = new Translator('fr_FR');
+$translator->addLoader('array', new ArrayLoader());
+$translator->addResource('array', [
+    'Hello World!' => 'Bonjour !',
+], 'fr_FR');
+
+echo $translator->trans('Hello World!'); // outputs « Bonjour ! »
+```
+
+Sponsor
+-------
+
+Help Symfony by [sponsoring][3] its development!
+
+Resources
+---------
+
+ * [Documentation](https://symfony.com/doc/current/translation.html)
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/symfony/issues) and
+   [send Pull Requests](https://github.com/symfony/symfony/pulls)
+   in the [main Symfony repository](https://github.com/symfony/symfony)
+
+[3]: https://symfony.com/sponsor