Use properly cast RDF content for testing

No change to the translator here, but would it be possible to use this target for testing, instead of the current one?

The RDF published by CiNii is backed up by some very nice infrastructure intended to separate primary field content from language variants. Unfortunately, many of the publishers and institutions from which they aggregate their data do the 1970's thing of just crushing English and Japanese into a single field, as in the existing test target. It's a terrible practice, and probably not one that deserves any recognition from Zotero.