Add Simplified Chinese language file

[wcxu21]

Add Simplified Chinese language file
You may also need to modify other files to support Chinese language display. Thank you for your work. ：-)

[MuertoGB]

Hi @wcxu21,

Thank you for your contribution adding Simplified Chinese language files to the application, I really appreciate the time and effort you've put in.

At the moment, I'm in the process of developing a language system for the application, and the current structure isn't ready to support multiple languages, therefore, I won't be able to merge your pull request yet.

Once the system is ready, I'll revisit your contribution so we can ensure it's integrated properly, and I'll make sure to credit you for the addition.

If you'd like, I can keep you updated regarding progress of the language system. Drop an email to [email protected].