Integrated i18n system throughout the application with `useLanguage` hook providing translation function and language state. Added bilingual support to all user-facing strings in App.jsx (password validation, error messages, game creation, sheet sections), AdminPanel (user management, form validation, status messages), AdminSettingsModal (SMTP configuration), ChipModal, DesignModal, GamePickerCard (lobby interface,
Implemented comprehensive email invitation functionality for new users. Added SMTP settings management in admin panel with configuration UI for host, port, credentials, sender details, and TLS options. Created invite token system with 48-hour expiration and single-use enforcement. Added mailer module with HTML email templates in German theme styling (radial gradient backgrounds, gold accents, bordered cards). Implemented invite
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