Evaluate which information is not displayed in HTML

[acka47]

Originates from #345 where the HTML view was broken by a change to GND RDF that was not backwards compatible with the lobid-gnd setup.

Now and then new information is added to the GND RDF and communicated via the lds mailing list and the LDS versions page

Sometimes the changes were requested by us for lobid-gnd users and then we incorporate them accordingly. Sometimes there are other changes that we not always keep track of.

To do:

• [ ] check which properties from the current version of the GND ontology are not covered in the lobid-gnd code that generates the HTML view.
• [ ] check how often the respective property occurs in GND data
• [ ] discuss which information needs to be prioritized to be added to the HTML view