fix(translations): complete Chinese theme translations

[SJFCS]

Completed untranslated portion

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

Test Plan

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
/	🟠 59	🟢 97	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 74	🟢 100	🟢 100	🟢 100	🟢 90	Report

[slorber]

Thanks

@Josh-Cena let me know if you can review

[slorber]

(we need the CLA signature to merge this PR in case you didn't already sign it - the bot can take some time)

[SJFCS]

(we need the CLA signature to merge this PR in case you didn't already sign it - the bot can take some time)

Three hours ago I have signed the CLA, but the robot did not pass

[Josh-Cena]

LGTM; one little suggestion. Don't worry about the bot; it can take very long...

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