I doubt many foreign governments would agree that all legal matters should be documented not only in the language of that country but English as well.

While some countries provide a non-binding translation for many things, someone could set the precedent in court that the English translation if relied on by enough people is somewhat binding or similar - Result would be two slightly different (mis-)understandings about the law, due process and bureaucracy from official sources. That could be have unforseen consequences.

Just because many people happen to speak English doesn't mean everyone has to.