Actually, american english is "en-US", "en_US" means english with the region set to the US, at least on iOS. But yes, it is checking that their region is set to

Actually, american english is "en-US", "en_US" means english with the region set to the US, at least on iOS. But yes, it is checking that their region is set to mainland china. https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPInternational/LanguageandLocaleIDs/LanguageandLocaleIDs.html#//apple_ref/doc/uid/10000171i-CH15-SW9 https://developer.apple.com/library/archive/documentation/Ma...