Update Czech translations for consistency

[JosefJezek]

Updated Czech translations only

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[Copilot]

Pull request overview

This PR updates the Czech (cs) translation strings in Starlight to improve wording and consistency with other locales.

Changes:

• Refined the “last updated” label wording while keeping the expected trailing colon.
• Added missing punctuation to the Czech 404 message.
• Improved consistency/grammar for the “Built with Starlight”, copy tooltip, and anchor heading accessibility label translations.

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[trueberryless]

Thank you for the update of Starlight UI strings for the Czech translation. 🙌

As this change is a change in the Starlight package, we'll need to add a changeset file as well. Could you please run pnpm changeset, select patch, and write something like Updates Czech UI translations into the Markdown content?

If you have any questions regarding that, feel free to ask or take a look at some docs for how we do it in Astro here 👍

[changeset-bot]

🦋 Changeset detected

Latest commit: aa6645d

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

This PR includes changesets to release 1 package

Name	Type
@astrojs/starlight	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[delucis]

Thanks @JosefJezek! As @trueberryless helpfully explained, we needed a changeset, but I’ve taken the liberty of adding one for you so we can get this released 🙌