docs: add chinese translation

[childrentime]

I added i18n to the configuration file,then add Chinese document translations. I've tested the build folder on my computer using nginx and it works fine.

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[coveralls]

Pull Request Test Coverage Report for Build 1949547722

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.553%

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Totals
Change from base Build 1774254151:	0.0%
Covered Lines:	786
Relevant Lines:	794

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💛 - Coveralls

[iChenLei]

non-dark mode

dark mode

The language dropdown item's color is bad for looking when you not using dark mode.

[mweststrate]

Thanks so much for adding these translations!❤️❤️❤️

[childrentime]

❤️🧡💛💚💙💜🖤ʕ๑•ɷ•๑ʔ❀

[github-actions]

🎉 This PR is included in version 9.0.13 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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