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It may be that the language settigs was accessed accidentally. Or it could have been a software glitch or error. The fix should be simple though.
You need to shut down the unit, then start it while holding your finger on the bottom right corner and then when it asks, select yes for clear all user data.
The video below will show you the process.
After its reset, it will restart. Then just select English as your language and you will be good to go~
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