Completely rename REBUS-related stuff to issues

changed milestone to %2.0a2

added type::bug label

mentioned in merge request !18 (closed)

created merge request !18 (closed) to address this issue

changed title from REBUSCategory is still being imported in forms.py though is has been renamed to IssueCategory to Completely rename REBUS-related stuff to issues

created merge request !19 (merged) to address this issue

mentioned in merge request !19 (merged)

mentioned in commit 55603876

closed via merge request !19 (merged)

added part::backend part::frontend labels