Progress bar for adding AND removing a Library

Just experienced that the removal of a bigger library takes quite long and there is no progress information found in the webui (except the "waiting" animation on the save button) and also not in the log file.
I was a little unsure if serviio is still working/running on the removal... it took 10-15min.
So i propose what is written in the subject.
I was a little unsure if serviio is still working/running on the removal... it took 10-15min.
So i propose what is written in the subject.
