wikiPageUsesTemplate should be in DBO namespace

[VladimirAlexiev]

See eg http://mappings.dbpedia.org/server/extraction/bg/extract?format=turtle-triples&extractors=custom&title=София (any resource actually):

<http://bg.dbpedia.org/resource/София> <http://dbpedia.org/ontology/wikiPageExternalLink> <http://www.sofia.bg> .
<http://bg.dbpedia.org/resource/София> <http://dbpedia.org/ontology/wikiPageLength> "91916"^^<http://www.w3.org/2001/XMLSchema#nonNegativeInteger> .
<http://bg.dbpedia.org/resource/София> <http://bg.dbpedia.org/property/wikiPageUsesTemplate> <http://bg.dbpedia.org/resource/Шаблон:Селище_в_България> .

Methinks that wikiPageUsesTemplate should be in the http://dbpedia.org/ontology namespace like the other two, because the idea "wikiPageUsesTemplate" is not language-dependent.