Resolve "Fix optional/additional field handling after editing event"

Closes #72

See merge request !73

Resolve "Fix initial data getting for school details"

Closes #71

See merge request !72

Merge branch '66-make-required-ness-of-contact-data-e-g-address-configurable-per-event' into 'master'

Resolve "Make required-ness of contact data (e.g. address) configurable per event"

Closes #66

See merge request !71

Resolve "Skip payment step when costs are 0 for an event"

Closes #68

See merge request !70

Resolve ""title" field of additional fields CRUD list causes name collision"

Closes #69

See merge request !69

Resolve "Migrations fail"

Closes #67 and #65

See merge request !68

Fix file_storage in register views

See merge request !67

Remove use of sass_tags

See merge request !66

fix core version

See merge request !65

Fix width of person-img

See merge request !64

Fix keyerror on registration

See merge request !63

Raise version

See merge request !62

Translations update from Weblate

See merge request !61

Currently translated at 96.4% (27 of 28 strings)

Translation: Hack'n'Fun/AlekSIS-App-Paweljong-Frontend
Translate-URL: https://translate.edugit.org/projects/hacknfun/aleksis-app-paweljong-frontend/de/

Translations update from Weblate

See merge request !59

Fix event additional field title

See merge request !60

Currently translated at 96.4% (27 of 28 strings)

Translation: Hack'n'Fun/AlekSIS-App-Paweljong-Frontend
Translate-URL: https://translate.edugit.org/projects/hacknfun/aleksis-app-paweljong-frontend/de/

Update formtools and dependencies

See merge request !58