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I'm running a mirror using nginx - cronjob works and /dist is viewable. The problem is that nginx apparently isn't supporting something like multiviews for language localization. Is there a workaround for that? Otherwise it says 403 since there's no (defined) index file.

In the past, I had to add all of the language files to mime.types defined as html pages. Such that html.en, pl, ar, fa, ru, etc were all served up as html.

You could also define index.html.en as a default index file, because at least that language will always exist.

Done. However, index.html.[de|pl|ar|fr|...] don't exist anyway!?