We have a separate fork of the Zotero translators at https://gerrit.wikimedia.org/r/mediawiki/services/zotero/translators
We periodically merge the upstream branch at https://github.com/zotero/translators into our branch.
Merge the upstream zotero branch into our fork on gerrit. You should squash the commit because gerrit won't let you push commits by other authors to gerrit. See: https://www.mediawiki.org/wiki/Gerrit/Getting_started on how to use Gerrit.