i18n(de): Update de.yml

[elsnoox187]

adding Missing keys

footer.sponsor
upgrade.implementationPR

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@arkid187 - Discord

I saw that the translation was easy and I felt like making my first commit to the project.
Astro has always inspired me to work with frameworks.

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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.

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