Stability improvements

Double scrollbar no longer hides training managers in the Assign Study to Training Manager pop-up (former known issue)

From now on, even though you have more than 6 training managers in your training study, you can still see them, and the interior scrollbar is no longer hidden.

Retracted workaround: You no longer have to use the wheel on your mouse to scroll down through training managers and you don't have to scroll all the way down to get to the interior scrollbar, either. (Issue: 29558168)

You can now remove new trainees from the Add Trainee pop-up (former known issue)

From now on, when you click the X at the end of a row for a new trainee, the trainee is removed. Moreover, the numbering of the trainees is now correct.

Retracted workaround: You no longer have to close the Add Trainee pop-up without saving and try again. (Issue: 29531404)