feat(i18n): add german lang keys for comparison feature

[stephfh]

Add missing german translation keys for the package comparison feature.

Note: I did not translate anything just “for the sake of having a german word in there“, as I think a translation should still feel natural to read and not “forced“.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
npmx.dev	Ready	Preview, Comment	Jan 31, 2026 8:17pm

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
npmx-lunaria	Ignored		Jan 31, 2026 8:17pm
docs.npmx.dev	Skipped		Jan 31, 2026 8:17pm

[github-actions]

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🔄️	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.