Resolve "Adapt for SPA"

Closes #62

See merge request !164

Translations update from Weblate

See merge request !150

Currently translated at 100.0% (38 of 38 strings)

Translation: AlekSIS/AlekSIS-App-Untis
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis-app-untis/de/

Resolve "Room model moved to core"

Closes #60

See merge request !163

Resolve "Support overlapping terms"

Closes #59

See merge request !161

Resolve "Importing exams broken due to missing time period"

Closes #57

See merge request !160

Resolve "Importing exams broken due to missing time period"

Closes #57

See merge request !159

Drop support for GitHub

See merge request !158

Undo wrong change in absence importer

See merge request !157

Release 2.3.2

See merge request !156

Merge branch '53-guess_school_id-migration-does-not-work-properly-coming-from-untis-2-1-3' into 'master'

Resolve "guess_school_id migration does not work properly coming from Untis 2.1.3"

Closes #53

See merge request !155

Resolve "Use teachers only as fallback for course group matching"

Closes #56

See merge request !154

Do release 2.3.1

See merge request !152

Fix two bugs with importing lessons

Closes #54 and #55

See merge request !151