su: add Simplified Chinese translation

[DustMerlin]

Checklist

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR contains at most 5 new pages.
• The PR is authored by me, or has been human-reviewed if it was created with AI or machine translation software.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

Reference issue: #

[ivanbaluta]

LGTM!
I don't speak Chinese, so I can't review the translation itself.

[kbdharun]

LGTM, merging this PR since it's been a week and there aren't any reviews from the CODEOWNERS. Also, I want to test if deploy key works in website repo after admin push prevention branch protection setting enablement. And it didn't work so reverted it.