Only use a subset of absence reasons in class register

added part::backend part::frontend source::customer::kath type::bug labels

changed milestone to /AlekSIS%"[NLnet #3] Test and review with pilot schools"

assigned to @ZugBahnHof

changed due date to July 13, 2024

created branch 290-only-use-a-subset-of-absence-reasons-in-class-register to address this issue

mentioned in merge request !382 (merged)

closed with commit 140b0ce9

mentioned in commit 140b0ce9