i18n(de): update German translation

[trueberryless]

Description

• fix: update links in i18n.mdx #2676
• Astro 5 + collection loaders + legacy collections support #2612
• docs: deprecated Astro.props.slug → Astro.props.id #2685
• Add Astro 5 banner to docs homepage #2671

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Tracked Files

Locale	File	Note
de	guides/i18n.mdx	Localization changed, will be marked as complete. 🔄️
de	guides/overriding-components.mdx	Localization changed, will be marked as complete.
de	guides/project-structure.mdx	Localization changed, will be marked as complete.
de	guides/site-search.mdx	Localization changed, will be marked as complete.
de	index.mdx	Localization changed, will be marked as complete.
de	manual-setup.mdx	Localization changed, will be marked as complete.
de	reference/configuration.mdx	Localization changed, will be marked as complete.
de	reference/frontmatter.md	Localization changed, will be marked as complete.
de	reference/overrides.md	Localization changed, will be marked as complete.

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.

[delucis]

Looking good! Thank you for the updates @trueberryless 🎉

Left a couple of small suggestions.

[trueberryless]

Nice! Thx for the review 😊

[trueberryless]

Just saw a broken markdown link last second, but now it's ready...

[delucis]

Perfect — and well spotted on the link! 🙌