known bugs:

- there is html-code in some plain text mails, because they use
  models.TYPE_CHOICES, which is in html, because it is mainly used for the
  website side of things.

- helptext by /intern email: "Bitte gib deine E-Mail-Adresse ein, damit dich
Wikimedia Deutschland bei Rückfragen oder für
die Zusage kontaktieren kann." maybe this this misleading?

- if the mailserver is unavaiable we just produce "Server Error 500", which is not very telling.
There should maybe also a way to handle mails later if first delivery failed.

- there are some issues with the ifg_volunteer_mail.txt template.

other known problems:

- The DatePicker works only if you are logged in, which is mostly ok for /intern
  and there is no Date to insert at the moment in forms for externs.

- we should add dates to the outputs, to make it more useful in logfiles

known problems in production:

- works only with django == 3.1.x

- reboot of container should be far more automated

- puppet should provide the git source, and secrets.json and settings.py link