Not sure! I've mentioned your issue to the developers. Hopefully they have an answer!
In the meantime, perhaps a fresh install of the app would be helpful?
HELP: Android app update turned language to CHINESE ??!!!
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May 12, 2015
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#4
Fresh install did reset settings to default, and I have applied my original preferences. Thank Kirk
Yesterday Chess.com app on my smartphone has been updated to the new version, but unfortunately the interface has been automaticaly changed from Italian to some ideographic alphabet I absolutely cannot understand: really an annoying BUG!
How can this be repaired?