translate German message into English (#4838)

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## Summary of the Pull Request
Translate automatically generated message text from German into English.

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## References
#4799

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## PR Checklist
* [ ] Closes #xxx
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [ ] Tests added/passed
* [ ] Requires documentation to be updated
* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

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## Detailed Description of the Pull Request / Additional comments
@miniksa mentioned in microsoft/terminal#4799 (comment)
> Actually..... we would consider that block to be wrong. It should have had the English error text there. [...] It's just our practice to have everything be in English as that's our company's working language. [...]

The translation is based on the message text found in the official docs: https://docs.microsoft.com/en-us/nuget/Consume-Packages/Package-restore-troubleshooting

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## Validation Steps Performed

src/tools/U8U16Test/U8U16Test.vcxproj

@@ -121,7 +121,7 @@
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
-      <ErrorText>Dieses Projekt verweist auf mindestens ein NuGet-Paket, das auf diesem Computer fehlt. Verwenden Sie die Wiederherstellung von NuGet-Paketen, um die fehlenden Dateien herunterzuladen. Weitere Informationen finden Sie unter "http://go.microsoft.com/fwlink/?LinkID=322105". Die fehlende Datei ist "{0}".</ErrorText>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them. See "http://go.microsoft.com/fwlink/?LinkID=322105" for further information. The missing file is "{0}".</ErrorText>
     </PropertyGroup>
     <Error Condition="!Exists('..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.191217.1\build\native\Microsoft.Windows.CppWinRT.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.191217.1\build\native\Microsoft.Windows.CppWinRT.props'))" />
     <Error Condition="!Exists('..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.191217.1\build\native\Microsoft.Windows.CppWinRT.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.191217.1\build\native\Microsoft.Windows.CppWinRT.targets'))" />