Add collection description to record

[mirjan-hoffmann]

Often the description of a record is very very sparse and you cannot see what this record is about. It would be helpful to have the description of the collection available directly at record-level. This way records could be found more easily and users can better understand what a record is about.

I would prefer a configurable solution. Maybe (if activated) just add the description of the series at the end of the episode-description