It's like they are just bad at this. The one device I have where I can't block YouTube's ads is set to route through Tokyo, so the ads are in Japanese, which I barely understand.

But you should be able to set the locale separately from language. You can easily do that on any Unix/Linux system. In your locale.conf, set LANG to your language and all other LC_* variables to your preferred locale.

Systems that do not allow this are badly designed. For a lot of multilingual people, locale and preferred language are independent.

Yeah but it didn't say locale or location, it said system language, that is what i was confused about language =/= location.

And that is just an example of horrible UI. Locales should not be tied to those things. Maybe set the defaults but not forced.