Completed German translation

uffd/default_config.cfg

uffd/invite/templates/invite/list.html

uffd/invite/templates/invite/new.html

uffd/invite/templates/invite/use.html

uffd/invite/views.py

uffd/mail/templates/mail/list.html

uffd/mail/templates/mail/show.html

uffd/mail/views.py

uffd/oauth2/templates/oauth2/logout.html

uffd/oauth2/views.py

uffd/ratelimit.py

uffd/role/templates/role/list.html

uffd/role/templates/role/show.html

uffd/rolemod/templates/rolemod/list.html

uffd/rolemod/templates/rolemod/show.html

uffd/rolemod/views.py

uffd/selfservice/templates/selfservice/self.html

uffd/selfservice/views.py

uffd/session/templates/session/deviceauth.html

uffd/session/templates/session/devicelogin.html