Update zh_CN Translation

[Pavel Sanda]

On Wed, Apr 10, 2024 at 01:40:25PM +0800, CD_Mking wrote:
> I have translated part of the zh_CN localization, using AI translation and subsequently conducting manual proofreading.
> I am providing only the po files as I am unable to package them into a format-patch, and the bundle file is too large to send.

Thank you.

One thing we need before commit is a blanket permission for your contributions
sent to lyx-devel at lists.lyx.org. It should look like
this:

https://marc.info/?l=lyx-devel&m=170428353115475&w=2

If you need to send large files you can use this address po-updates at lyx.org next time.

Pavel