ZZCS-33 Fix a problem where incorrect language results would be returned for dbpedia fetches #743
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When fetching a resource from dbpedia, and If a predicate is present in multiple languages, then these languages are mixed in all rows of the search results.
It looks like a kind of combinatorial explosion of all language values.
Ideally the spqarql query should group by language of the returned predicates.
As that doesn't seem to be trivial, we now group the returned predicates by language and try to find the best matching triple value for the requested language.