Hi, please see this ticket: phabricator:T282846 Thanks.
Topic on User talk:PPelberg (WMF)
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@Martin Urbanec (WMF), Peter will probably see your ping on Phab, but as a general rule of thumb, as long as the wiki doesn't use a million templates (like the English Wiktionary) or use Extension:Proofread Page (the Wikisources), then the Editing team doesn't object. You should wait for an official reply, but I think you could safely start writing your patch while you're waiting. :-D
@Whatamidoing (WMF) Thank you very much for the information. Replying for my volunteer account, as I don't work on this ticket in my WMF contractor capacity.