Extend `Verify host` with the ability to also choose ZajemceoStudium

[1ukastesar]

Should do the same as Verify host but also add ZajemceoStudium role. Right now done manually and that's not very convenient and error-prone

[1ukastesar]

We agreed that it will be better to show modal on every Verify host which allows to choose if ZajemceoStudium is desired or not. It can also act as a confirmation dialog. Also removing good first issue as modal is not that trivial to implement IMO.