Ordering for event registrations in backend is lexicographically, not chronological
One-sentence description
Ordering in the events backend should be chronological when sorting based on a datetime field.
Current behaviour
When ordering on the "Registration start" field, for example, the registrations are sorted lexicographically, as can be seen in this screenshot:
Expected behaviour
When ordering on a datetime field, the registrations should be ordered chronologically.
Steps to reproduce
- Create registrations for June 2nd and July 1st for a certain event.
- Go to the admin page for that specific event.
- Notice that the registration in July is shown before the registration in June.
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