Affected teachers in header box

If a teacher is marked as affected in more than one substitution, the teacher is listed in the header box for every substitution where the teacher is marked as affected.

added part::frontend prio::2 type::bug labels

changed the description

mentioned in merge request !40 (closed)

created merge request !40 (closed) to address this issue

closed via commit 8cbb193c

mentioned in commit 8cbb193c