Expose FS translation system to plugins

[HiDeoo]

Description

This plugin exposes the file system translation system to Starlight plugins throught the setup hook using a new useTranslations() callback function.

This change requires the addition of a new plugin hook (currently named init, I picked the first thing coming to mind to get started) which now exposes the injectTranslations() callback function (which was previously available in the setup hook).

The documentation so far is only a rough draft to get an idea of everything changed.

Remaining tasks

• Restore the docs/astro.config.mjs file
• Restore the docs/package.json file
• Restore the docs/src/content/i18n/zh-CN.json file
• Remove the entire packages/demo-plugin/ directory
• Run pnpm i to remove mention of the starlight-demo-plugin package in the lockfile
• Remove all remaining // TODO(HiDeoo) comments (if any)

[changeset-bot]

🦋 Changeset detected

Latest commit: 5eb0121

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@astrojs/starlight	Minor
starlight-demo-plugin	Patch

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[HiDeoo]

Expressive Code technically expects a Starlight language here so I changed it but this is not a bug fix (no changeset) as Expressive Code lower-cases the language identifier anyway.

[astrobot-houston]

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Tracked Files

Locale	File	Note
en	guides/i18n.mdx	Source changed, localizations will be marked as outdated.
en	reference/plugins.md	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.