Respect permissions in coursebook frontend

e.g. for personal notes, participation status, extra marks, ...

added part::frontend label

added source::customer::kath label

assigned to @yuha

added type::bug label

created branch 295-respect-permissions-in-coursebook-frontend to address this issue

mentioned in merge request !398 (merged)

mentioned in issue #289 (closed)

changed milestone to /AlekSIS%"[NLnet #7] Fix bugs, improve usability, and implement additional features based on feedback reports by pilot schools in timetable management and class register"

closed with merge request !398 (merged)

mentioned in commit e934ccef