Except that in cases where Apple devices don't just work you are screwed. A few years back a friend of mine had her MacBook Air's system language suddenly chang

Except that in cases where Apple devices don't just work you are screwed. A few years back a friend of mine had her MacBook Air's system language suddenly change and wasn't able to change it back as the option panel to do so just froze each time. I had to do an extensive Google search as most answers I found were generic variations of "bring it to an Apple shop" or "reinstall and use a backup" (which we did, didn't fix the issue). In the end I had to edit some config file to switch the language back. Safari's language was still wrong afterwards, but she could live with that.