i18n(zh-cn): Update `plugins.md` & `i18n.mdx` #7740

Job	Run time
Check for accessibility issues	2m 23s
changes	3s
Run type checks	35s
Docs site builds on Windows	1m 59s
Check for broken links	1m 35s
Run unit tests	0s
Run E2E tests (${{ matrix.os }})	0s
	6m 35s

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