Update language support to zh

[tengqm]

Docsy has renamed language 'zh' to 'zh-cn'. This is causing a huge problem for the Chinese localization.
This PR is a first step to fix this problem. Follow up PRs are needed to fix all the relative links.

[k8s-ci-robot]

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[tengqm]

/hold
Not sure if there is a better workaround for the language rename issue.
It might be a huge task for the 1.24 release.
However, if we don't do this now, after dev-1.24 going live, we will not be able to track changes to be synced for Chinese localization.
So ... I'd prefer to get this done NOW. As for 1.24 release, /content/zh won't be causing many conflicts.

[tengqm]

/hold cancel

[jihoon-seo]

This PR will close #33002.

[Preview]

• One page from the preview: https://deploy-preview-33050--kubernetes-io-main-staging.netlify.app/zh-cn/docs/concepts/overview/what-is-kubernetes/
• Corresponding page on k8s.io (I mean, as-is): https://kubernetes.io/zh/docs/concepts/overview/what-is-kubernetes/

[sftim]

Oops. The update looked OK to me but I didn't try following links.

We could add a 302 redirect from /zh to /zh-cn/, and remove that redirect eventually (some years from now)?

[jihoon-seo]

Links in the preview of this PR (like here and there) are still pointing /zh/, and I guess that this is because:

Suggested change

	contentDir = "content/zh"
	contentDir = "content/zh-cn"

But it might be okay, since the PR #33051 is already covering this.

Links in the preview of the PR #33051 looks fine:

• https://deploy-preview-33051--kubernetes-io-main-staging.netlify.app/zh-cn/docs/concepts/overview/what-is-kubernetes/#what-s-next
• https://deploy-preview-33051--kubernetes-io-main-staging.netlify.app/zh-cn/docs/concepts/overview/components/#control-plane-components

[tengqm]

Cannot change it yet. Because we don't have the content/zh-cn directory yet in this PR.

[tengqm]

We could add a 302 redirect from /zh to /zh-cn/, and remove that redirect eventually (some years from now)?

Yes. Adding a single 302 redirection would be nice.

[tengqm]

/close
This solution is too disruptive.

[k8s-ci-robot]

@tengqm: Closed this PR.

In response to this:

/close
This solution is too disruptive.

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