来自 https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html#//apple_ref/doc/uid/20001431-130430 ， CFBundleDevelopmentRegion 是语言和区域，例如en-US，不只是 en.

From https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html#//apple_ref/doc/uid/20001431-130430 , CFBundleDevelopmentRegion is the language and region, e.g. en-US, not just en.