Allow to search using rdfs:label

[mrivoal]

Users should be able to search through rdfs:label :

• in the full-text search : already feasible
• in the advanced search, by selecting the property rdfs:label for each resource class defined in a project-specific ontology.

[mrivoal]

Related to Knora's issue 802.

[tobiasschweizer]

fulltext search always includes the rdfs:label, see https://github.com/dhlab-basel/Knora/blob/develop/webapi/src/main/twirl/queries/sparql/v2/searchFulltextGraphDB.scala.txt

[mrivoal]

Ok. I was mistaken because, sometimes, the search results are not satisfying (if you search for rdfs:label containing numbers or characters such as _, you won't get any results. But I guess it is a separate issue. I will open one.

[gfoo]

Not satisfying results maybe due to dasch-swiss/dsp-api#1379 ?