* Add QR-Code for API-Url/Key
* Show only API-Keys for current user
* Allow only admin users to create custom API-Keys
* Use a managed package of qrcode-generator instead of a copy of the JS file
* Reuse existing localization string (API key)
* Center QR-Code in popups
Co-authored-by: Bernd Bestel <bernd@berrnd.de>