EDIT

fix #7249

ref #7322 showing sumbitter per registration in working set editor

adding button descriptions to RegistrationItemNameAndTypeButtons

ref #7322 hiding addTypeButton when user is not permitted to update the registration

ref #7269 manaing enabled state of messages button and adding description text

ref #7269 improving layout of RegistrationMessagesPopup and harmonization of styles

ref #7269 layout improvements in messages popup window

ref #7269 basic implementation of the registration messaging UI

documenting

fixing bug in ShowDetailsEventEntityTypeFilter: wrong filter class used