Removes en-us to improve documentation localization

[JonDouglas]

Summary of the changes (in less than 80 characters):

• Removes en-us from many locations to improve documentation localization.

[JonDouglas]

Did I break resource files on mac? I can't see CI so I won't know.

[joelverhagen]

Looks like we have some explicit assertions on the warning message.

    NuGetGallery.PackagesControllerFacts+TheDisplayPackageMethod.OneSecondCacheTime [SKIP]
      Flaky test, tracked by issue https://github.com/NuGet/NuGetGallery/issues/8231
    NuGetGallery.Authentication.V3HasherTests.ProcessingTimesForSuccessfulAuthAndFailedAuthAreSimilar [SKIP]
      This test is not deterministic. Lets not run it as part of CI
##[error]    NuGetGallery.PackageMetadataValidationServiceFacts+TheValidateMetadataBeforeUploadAsync.WarnsAboutPackagesWithoutWhenEmbeddedReadmeNotEnabledAndDisplayUploadWarningV2Enabled [FAIL]

      Assert.StartsWith() Failure:
      Expected: Readme missing. Go to https://learn.microsoft.com/en-us/nuget/create-packages/package-authoring-best-practices#readme learn How to include a readme file within the package.
      Actual:   Readme missing. Go to https://learn.microsoft.com/nuget/create-packages/package-authoring-best-practices#readme learn How to include a readme file within the package.
      Stack Trace:
        tests\NuGetGallery.Facts\Services\PackageMetadataValidationServiceFacts.cs(0,0): at NuGetGallery.PackageMetadataValidationServiceFacts.TheValidateMetadataBeforeUploadAsync.<WarnsAboutPackagesWithoutWhenEmbeddedReadmeNotEnabledAndDisplayUploadWarningV2Enabled>d__71.MoveNext()
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
##[error]    NuGetGallery.PackageMetadataValidationServiceFacts+TheValidateMetadataBeforeUploadAsync.WarnsAboutPackagesWithoutReadmeWhenDisplayUploadWarningV2Enabled [FAIL]

      Assert.StartsWith() Failure:
      Expected: Readme missing. Go to https://learn.microsoft.com/en-us/nuget/create-packages/package-authoring-best-practices#readme learn How to include a readme file within the package.

We have the strings hard coded unit some unit tests, so these also need to be fixed up.

C'mon man, throwing your mac under the bus so quickly? 😄 (I wouldn't have been surprised if some line ending stuff showed up :))

[Mikejo5000]

Will it take much work to fix the unit tests and merge this? Thanks!

[Mikejo5000]

@joelverhagen @JonDouglas Thanks!

[joelverhagen]

@Mikejo5000, this is deployed to www.nuget.org now. Thanks for bringing attention to this! @JonDouglas, thanks for doing the hard work here!