Hi,
ExternalTranslate.js [1] adds a translate tab to translate an article to another wiki.
Please test and fix whatever you find useful to fix...
[1]
https://en.wikipedia.org/wiki/User:Gryllida/ExternalTranslate.js
[2]
https://meta.wikimedia.org/wiki/Meta:Babel#Translate_wiki_pages_to_another_…
Gryllida