Well that's the first time I've legitimately gotten upset at a UX decision in a long, long time. My wife is homesick, 5000 miles from her country and can't watch anything in her language... Because they couldn't be bothered with an advanced settings UI anywhere? Seriously, Netflix?

Maybe that's an entitled attitude, but to me it's in the same ballpark as accessibility. It might not make a difference to 99% of users, but to the 1% of users in the long tail, it's royally screwing them for lack of a relatively small amount of effort. (In this scenario, a tiny amount of effort).

As someone said above, she should try to change the language of the interface to her language.

In my experience, that’s not a solution. I always use Netflix in English, but frequently encounter US content with only regional subtitles and no English track.

So set the UI language to watch she wants it to be? This is what profiles are for.