Update zh_cn.lang for 1.21

[suoyukii]

Simplified Chinese rework to match the most recent en_us file.

[jaquadro]

Hey, thanks for providing a translation. There's been a significant change in the naming of the drawer variants, which are now combined from two smaller sets of keys. This file is still naming each variant directly.

I'm trying to shift to managing translations on Crowdin. If you're interested in contributing translations there, I believe you can start by uploading this file to add most of the strings, after updating it to match the current en_us. If not, I can upload it on your behalf. There's also a few more strings that have been added to the language file since this PR.

https://crowdin.com/project/storage-drawers

[suoyukii]

Translated 53% of the new text, I'll translate the rest when I have time.