Missing unicode literal `u`
URL construction for extension-less files
Missing `only_conflicts` in template
Revert "Adjust following entries in moveEntriesBelow"

This reverts commit 68863de77f46ea9588733b218fcba9ed51cae840.
Fix assignment of avatar fields

Lists are returned for some fields
Fix cloning bookings
Temporary fix for Avatar creation

Authenticators don't seem to agree on how to send the user data.
Fix template when no deadline is set
Point assessment link to assessment page
Fix unbound local error