fix(theme-translations): add missing zh-Hans messages

[chudongvip]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

It is not fix a bug, just help translate default translates of language zh-Hans.

Test Plan

NO

Test links

Deploy preview: https://deploy-preview-_____--docusaurus-2.netlify.app/

Related issues/PRs

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 88	🟢 97	🟢 92	🟢 100	🔴 33	Report
/docs/installation	🟠 74	🟢 98	🟢 92	🟢 100	🟠 89	Report

[slorber]

Thanks.

We need you to sign the CLA otherwise it's impossible to merge. (sometimes it can takes hours to report your signatures so we'll just have to wait)

[slorber]

@chudongvip can you sign the CLA please?

Otherwise I'll have to close and let someone else submit a fix

[chudongvip]

@chudongvip can you sign the CLA please?

Otherwise I'll have to close and let someone else submit a fix

Sure. I have signed the CLA just now. I'm sorry for not replying to you in time

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[slorber]

Thanks 👍