i18n(de): Translate astro-courses.mdx

[randomguy-2650]

Description (required)

This PR translates the “Courses” (astro-courses.mdx) page to German.

Related issues & labels (optional)

• Suggested label: i18n, hacktoberfest-accepted

Hacktoberfest 🎃

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Tracked Files

File	Note
de/astro-courses.mdx	Localization added, 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]

Looks good to me, left a small comment 💬

[trueberryless]

Awesome update 🙌

[yanthomasdev]

LGTM! Good job 🙌