Done:
class BegStaEdi = has to be Stage-student info, not company info + adjust goedkeur mail to mention which semesters were accepted + send afkeur mail & add reason (use popup msg box?) + refresh list or better option after goedkeur of afkeur
class StuStaEdi = implement mailing for both
fix goedkeur-afkeur query because IS NULL = still showing everything

Memo list - still to edit:
fix goedkeur-afkeur setters are not setting boolean