What should I do if the language of the Win10 system comes with an application?

For some needs, Xiaobian added the English input method to the Win10 system, but later found that the language of the application such as mail, calendar and map that comes with the Win10 system became English. What should I do?

Solutions
This problem occurs mainly because the English input method is set to the default input method by mistake. Therefore, the Windows 10 system may determine that the current user is in English. Native language users, so set the language of the app to English.
We will change the default input method back to Chinese input method. For details, please refer to the tutorial "How to change the default input method for Windows10". After changing the default input method back to Chinese input method, the language of these applications is restored to Chinese.