I think we (all) can make a difference between ‘plain english language’ as code language (which is a result of multilateralism and, in fine, helps us with understanding, control/governance and global communications/exchanges VS the ‘english’ language that carries along a culture, other tenants and eventually an inclination towards an ideology (and then eventually, one you do not adhere to).
I think ‘plain english code’ and ‘open sources’ are our best option today to 1) keep control, 2) unite/debate and 3) make sure we all understand the same thing. Also note: I would have loved to learn chinese (and about 130 other languages) but sadly, I never found the time to do that 
Edit: Did I mention that english is not my language. My languages are FR and DE, and not enough of IT for a swiss citizen;) and with just low- to average- knowledge of ES, PT, NL, DU, SV. In conclusion, I think translating ‘the frame/walkthrough’ of the doc is sure a ‘nice to have’, but I don’t see it as essential (or a ‘must have’). I also think that, if it was to be done, it should be done with both ‘care’ and ‘expertise’ (and not just ‘rushed’ in immediate response to some comment). Again, in my opinion only.