What I'd recommend, and what I've seen other languages do, is turn this into a "work in progress". You can work on one section at a time and update the PR as you go, asking people to review sections as you go by them.

I think it's important to keep a page on a single PR -- if it's split up into multiple sections, the style can get inconsistent and it'll be harder to read and verify. This was the problem we had with Crowdin: people only translated sections of even single sentences of a page and the end result would be a mishmash of English and the translated language.