Further developement #8

Hi,

I'm pimping the plugin up quite a bit for our pretix instance. Following features are represented:

• org-wide templates
  • lower maintanance
  • define mail text for quick sending in order details
• tie template to checkin-list (select who gets which certificate, eg for pass and fail)
  • template only available to participants checked in on this list, no accidental sending of wrong cert
• self-service download
• signing with org P12 cert
• german translation

https://github.com/et15/pretix-plugin-attendance-certificate

Disclaimer: that all would have been a bit much for me allone, I got help fom Claude code.

Is there interest that these fetures get merged upstream? If so, I would bring them in form for a pull request. Just let me know please.

Best, ET