Update Chinese lang ID: zh → zh-cn

[jihoon-seo]

Recently, Docsy has renamed language 'zh' to 'zh-cn'.
(Ref: google/docsy#832)

And after updating Docsy used by kubernetes/website repo,
this causes some issues (like this, and so on..).

To resolve this, Qiming Teng, an active English & Chinese approver in kubernetes/website repo, suggested a solution:
update the Chinese language identifier from zh to zh-cn,
causing everything under https//kubernetes.io/zh/* to be moved to https//kubernetes.io/zh-cn/* .

• Update language support to zh kubernetes/website#33050
• Rename zh directory to zh-cn kubernetes/website#33051

It is likely that we update our Docsy version some time or other, and that we will encounter this issue too.

So I suggest to update the Chinese language identifier from zh to zh-cn in CNCF Glossary project, before dev-zh goes live,
because updating before dev-zh going live will be better than updating after dev-zh going live.
(Which means that Chinese contents will be live in https://glossary.cncf.io/zh-cn/, not https://glossary.cncf.io/zh/.)

How about your thoughts,
Chinese approvers (@hanyuancheung @Jacob953 @Rocksnake @Submarinee) and
maintainers and English approvers (@cjyabraham @CathPag @JasonMorgan @seokho-son @iamNoah1) ? 😊

[Refs]

• i18n:Chinese translation google/docsy#732
• Add zh-cn support for i18n google/docsy#712
• update zh.toml and zh-cn.toml google/docsy#826
• fix: there is no need existing two i18n/zh*.toml files google/docsy#832
• i18n/zh.toml file in Docsy was renamed, causing many warnings kubernetes/website#33002

[seokho-son]

Hi @cjyabraham
Do you have a plan to update Docsy theme version ? :)
If we update it, we need to apply the issue raised by @jihoon-seo

[cjyabraham]

I'm not planning it, however, it makes sense to update it if we want to take advantage of any updates and new features. So I think this issue is a good idea to get ahead of the directory change.

[hanyuancheung]

On behalf of the Chinese team, I agree to change the branch name as suggested!

[jihoon-seo]

Resolved by #869.