i18n(zh-CN): translate i18n.mdx

[Genteure]

Description

Update translation for guides/i18n.mdx.
Corresponding source file changes:

• c6a4bcb Add Expressive Code to Starlight #742
• 4b3143b Add more EC text markers and frames to Starlight docs #1102
• 00d101b Add extend options to docs and i18n schemas #1162

I also made some formatting changes and now the translated file is matching the English version line by line.

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[Genteure]

schema is left untranslated here because:

• This is a pretty commonly used word in the context of frontend, typescript and databases so everyone should be able to easily understand what it means.
• I kinda don't agree with the current translation of schema in Astro docs, technically "schema" can be translated to "模式" but I have never seen it being used this way in any documentation until I searched about it just now. "模式" is much more commonly being used to mean "mode".
• I feel like translating it just for the sake of translating everything only ended up hurting readability.

[HiDeoo]

Thanks for the translation 🙌

As a non-native speaker, I reviewed this PR using the Docs Translation Review Checklist. Thanks for clarifying for schema, I think you're the best to know if it's relevant/better to keep it in English or not and if at some point someone wants to translate it, this could be easily discussed in a new PR.

One tiny details, this is missing the highlight of the very first code block added in https://github.com/withastro/starlight/pull/1102/files#diff-4c65fc770580b991c60e2b800f0c7ed48935c7bf31959943e2118b7e243ed7c1R14 and unfortunately I cannot suggest a change as it's oustide of the reviewable area.

Except that, everything looks good to me 👍

[HiDeoo]

Thanks for the quick fix.