This is really terrifying in the context of machine translation. I've seen a few forums (I think they were Discourse installs?) configured to automatically translate posts not in your browser language. It's very hard to tell that the post wasn't originally posted in English unless you look very hard for the tiny light-gray-on-white-background text.

Machine translation, to put it mildly, is utterly hopeless at context and nuance. I've had Google spit out very racist/sexist results from innocent source text. The fact that it's so confident about what it shows, and that the engineering teams working on these products have very little modesty, means that people treat it as a source of a truth.

A future where you have no clue if what you are reading is something written by a human as-is, or went through machine translation and might have nothing to do with what the original author intended, does not put me at ease.