Add translation

[MomentQYC]

Chinese (China, Simplified) translation is now complete
There may be some errors, but the whole should be fine

[MomentQYC]

It seems that "Simplified Chinese" and "Chinese (China, Simplified)" are duplicated and can be directly replaced.

[sandhose]

Many thanks for your contribution! I did quickly reviewed through reverse-translation and approved most of them. They will be included in the next translation sync in the next release

[MomentQYC]

Many thanks for your contribution! I did quickly reviewed through reverse-translation and approved most of them. They will be included in the next translation sync in the next release

Note that there are some fields that I have improved to make them easier to understand in the Chinese context.
The reason I'm not sure is that I haven't deployed the current version of MAS to confirm which fields correspond to which functions.

[sandhose]

So there were a bunch of issues with the language fallback logic. I did move the zh-CN#Hans to zh#Hans in Localazy as this is the one we use in other projects.
I then made sure that zh-CN falls back to zh#Hans, which hopefully makes sense.

It should be deployed in a few minutes to the OIDC playground at https://auth-oidc.lab.element.dev if you want to try out

[MomentQYC]

It should be deployed in a few minutes to the OIDC playground at https://auth-oidc.lab.element.dev if you want to try out

I fixed three errors based on what I've seen so far