Exporting citations in a language that differs from zotero

There used to be a way to make zotero use english in citations and bibliography, although the zotero UI _and_ the citation style was in german.
The trick was to open about:config and search for "extensions.zotero.export.bibliographyLocale" and choosing en-US as the language.
Now I can't find that entry in about:config any more. Is there another way to achieve this now?
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