Class register / personal notes unusable on mobile devices

On mobile devices, the table for entering perosnal notes in a lesson is completely unusable.

changed due date to February 08, 2022

added part::frontend prio::1 type::bug labels

assigned to @lloydmeins

created merge request !269 (merged) to address this issue

mentioned in merge request !269 (merged)

mentioned in issue #207 (closed)

assigned to @ZugBahnHof and unassigned @lloydmeins

closed with merge request !269 (merged)

mentioned in commit 4fcdd593