How to switch the subtitle language of Hulu on Apple TV
So i was having the same problem and stumbled on the solution.  While watching the video hit the pause button on the Apple TV controller.  then swipe down.  A menu bar should appear at the top of the paused video Info  Subtitles Audio  When you hover over subtitles you will see it defaulted to Spanish.  Just switch to English.  Wow, so simple but took me forever to accidentally swipe down after pausing and then the menu appeared.  Good luck.