i18n(de): add emdash.mdx translation

[danielmlr]

Description (required)

Adds the German translation of the EmDash CMS guide, following the English page merged in #14428.

• This is the first individual CMS guide in German (de/guides/cms/ so far holds only index.mdx). Two terms follow EmDash's own German admin: Adminbereich and Einrichtungsassistent.
• EmDash ships a German admin catalog and resolves the locale from the emdash-locale cookie, then Accept-Language. A reader on a German browser gets German labels, so the steps name those: Webseite, Benutzerkonto, Anmelden, Passkey erstellen, Speichern, Publizieren. + Post stays, because that button takes its label from the seeded content type, not the UI catalog.
• Internal links point to /de/ and keep the English anchor where the target page has no German translation yet, as the existing German pages do.

References

• Related to Expand the EmDash CMS guide from stub to full guide #14428

[astrobot-houston]

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de/guides/cms/emdash.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.

[github-actions]

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[randomguy-2650]

Mostly good but I’m currently only checking for vocabulary and such. Once I have time I’ll review this a bit more throughly.

[randomguy-2650]

Yeah… I’m not so sure about “quelloffen”, it just sounds really bureaucratic in a way. I’ve also never come across it that often.

[danielmlr]

Agreed. No other German page uses quelloffen, and the ones that mention open source all write Open-Source, so it now reads ein Open-Source-Full-Stack-CMS (d4f2d64).