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This reverts merge request !893

The translation files are fully changing all the way and that leads to
diffs not being inspected. This overrides the defaults of the
`makemessages` command in an ugly way, but it works.

This reverts merge request !738

One about timezones, the other about a deprecationwarning

This is recommended by the Django documentation

Redo migrations

Move pages and admin to payments app

Adjust and add tests

Update docs and fix codestyle

Fix migrations