Adding new property "See also"
For the curated items some links were put into the property media
that were not pictures but also not directly media types (e.g. a link to a YouTube-video but not to the raw video format). Therefore @matej.durco, @stefan.probst and me decided to introduce a new property See also
(key: see-also
). There every link should be put, that have a relation to the item but is not an item itself on the MP.