Rename field "abbrev" to "short_name" (subject model, ...)

added type::refactoring label

assigned to @hansegucker

changed milestone to %2.0a2

Must be done before 2.0a2 release to prevent nasty migrations with tons of data.

mentioned in merge request !53 (merged)

created merge request !53 (merged) to address this issue

mentioned in commit aacfe285

mentioned in commit AlekSIS-App-Alsijil@7832a360

mentioned in commit AlekSIS-App-Untis@110775cd

mentioned in merge request AlekSIS-App-Untis!17 (merged)

mentioned in merge request AlekSIS-App-Alsijil!42 (merged)

closed via commit aacfe285

closed via commit 181a6a9e

mentioned in commit AlekSIS-App-Untis@86eb1dc3

mentioned in commit AlekSIS-App-Alsijil@c8431ea9

added part::backend part::frontend labels