feat(i18n): add German (de) admin translations

[peterhadorn]

Summary

First community translation of the EmDash admin interface into German (de).

• Translates all currently extracted admin strings (40 strings across Settings, Login, LocaleSwitcher)
• Uses formal "Sie" form (standard for Swiss/German/Austrian business software)
• Keeps universally understood English terms: Dashboard, Plugin, Passkey, Magic Link, SEO, API
• Adds "de" to Lingui config and registers { code: "de", label: "Deutsch" } in SUPPORTED_LOCALES

Changes

• lingui.config.ts — added "de" to locales array
• packages/admin/src/locales/config.ts — registered German locale
• packages/admin/src/locales/de/messages.po — complete German translations

Context

Follows #234. Happy to expand as more strings get extracted in feat/admin-i18n-strings.

Test plan

• pnpm --filter @emdash-cms/admin locale:compile succeeds
• Language selector appears in Settings when >1 locale exists
• Switching to Deutsch shows German strings on Login and Settings pages
• All placeholders ({email}, {error}) render correctly

[changeset-bot]

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Latest commit: d9390d6

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[github-actions]

All contributors have signed the CLA ✍️ ✅
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[peterhadorn]

I have read the CLA Document and I hereby sign the CLA

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commit: d9390d6

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[ascorbic]

Thanks!