Earlier quoted context omitted.
Better explanation: monolingual people thinks that computers will always be configured to the local language and any other setup is a "misconfiguration". In real life a large number of corporations (and developers) have their computers configured with English as this is the main language of the coorporation and makes IT-support much easier. (we don't even need to talk about how badly botched many language translation…
Unfortunately the problem exists in both directions. I run my setup entirely in English and Google will still try to squeeze in the local non-english language. Confusingly Google will also write some sentences half in english and half in the local language. E.g. "Google is also available in: " (rather than the full sentence being in the foreign language. It's the kind of attention to detail that I've become accustome…
This specific one might be on purpose to avoid translating language names. If you land in page entirely in Chinese but you see the word "English" in Latin characters under a link, you can click it to escape. But if it's itself in Chinese you'll never find it. I do the same in applications, have a menu for languages but don't translate language names, if you change language by mistake you can always find your way back.