This is how to change the language from any language:
1. At the Apple TV home screen click the word furthest to the right.
2. Click the first item there.
3. Click the item third from the bottom.
4. Select your new language.
I just did the same mistake and I followed the previous instructions but there is a small correction.
This is how to change the language from any language:
1. At the Apple TV home screen click the word furthest to the right.
2. Click the first item there.
3. Click the fourth item from the bottom (not the third)
4. Select your new language.
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change language setting
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