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

- maybe change logo in browser dark mode to https://upload.wikimedia.org/wikipedia/commons/2/2a/Wmde_logo_vert_weiss.png

- warning from django 3.2:
input.BusinessCard: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'.
	HINT: Configure the DEFAULT_AUTO_FIELD setting or the InputConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django.db.models.BigAutoField'.