Add generic labels for forms

These should be centralized somewhere. Current set is for coursebook absences.

changed milestone to /AlekSIS%"[NLnet #3 (closed)] Implement support for absences"

assigned to @permcu

created branch 1035-add-generic-labels-for-forms to address this issue

mentioned in merge request !1492 (merged)

closed with merge request !1492 (merged)

mentioned in commit d457d6d5