i18n(de): update sidebar, ref/config, ref/front

[trueberryless]

Description

This PR updates the German translation of guides/sidebar.mdx, reference/configuration.mdx and reference/frontmatter.mdx with the changes from #3618

I didn't include the reference/route-data.mdx changes yet, so we have small chunk PRs 👍

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Tracked Files

Locale	File	Note
de	guides/sidebar.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.

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.

[HiDeoo]

Thanks for the translation 🙌

As a non-native speaker, I reviewed this PR using the Docs Translation Review Checklist and everything looks good to me 👍