I believe what is happening here is that your Apple TV is set to playback your movies with the French alternative audio track (if available.) There is an article here about where to find that setting and change it:
If that does not resolve the issue, you may have to visit this link, about reporting issues with purchases you have made:
Take care, and thanks for visiting the Apple Support Communities.
Hi Braden. I have the same issue and have reported it to apple. Identical glitch: blade runner is English on my Mac, but French when streaming from the net on Apple TV. Playback language settings have been verified to be English multiple times. I would prefer not to use airplay to play the movie. The is not user error, since so many iTunes customers have reported the same problem with blade runner. After reporting the issue apple reps said to check playback settings. I have gone further and reset my device entirely. Still in French! The version on my Mac and ipad is English, so this is strange indeed. Very disappointing to not have my favorite film available in English on my TV without needing to airplay share it.