Wikipedia: handle separators in authors and publishers, add language

Tested locally by exporting about a hundred works from Primo (beic.it).
The date range should already be handled in the <a href="https://github.com/zotero/translators/blob/master/Primo.js#L277">Primo translator</a>. I tried this also in your primo instance and it worked there too. We could delete the remaining parenthesis on import. However, the ":" as seperation for the "de" looks for me quite unusual, cf. the <a href="http://viaf.org/viaf/103105362/">names in viaf</a>