New: a short introduction on first launch. It walks through the reception screen in 6 steps, from switching languages to the evacuation list.

Also in this version:

- The evacuation list reports "status unknown" when it cannot confirm who is on site. An all-clear that might be wrong is more dangerous than none at all.
- Check-out now finds short names too. The search starts at 2 characters and never shows other visitors' names.
- Pre-registration: invited guests confirm the safety briefing in their browser beforehand and receive their QR code by e-mail. At reception, all that is left is the scan.
- The logo on the reception screen scales with the device.
- Smaller fixes to wording and e-mails.