i18n(de): Improve YAML translations

[randomguy-2650]

Description (required)

This PR improves the translations in the de.yml file to display custom translated results in Astro’s documentation.

Related issues & labels (optional)

• Suggested label: i18n, hacktoberfest-accepted

Hacktoberfest 🎃

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Tracked Files

File	Note
src/content/i18n/de.yml	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.

[trueberryless]

LGTM 🎉

The only change I am sceptical about is the To-Do change, since this is very uncommon...

[yanthomasdev]

LGTM! Thanks!