remove *.en.xlf hack (#6377)

Author: brettfo

FSharpBuild.Directory.Build.targets

@@ -4,10 +4,6 @@
   <Import Project="eng\targets\NuGet.targets" />
   <Import Project="FSharp.Profiles.props" />
 
-  <PropertyGroup>
-    <XlfLanguages>en;$(XlfLanguages)</XlfLanguages>
-  </PropertyGroup>
-
   <PropertyGroup Condition="'$(UseAssetTargetFallback)' == 'true'">
     <!--
     HACK: Necessary because the `netstandard1.6` version of FSharp.Compiler.Private requires a package that isn't

scripts/VerifyAllTranslations.fsx

@@ -28,7 +28,6 @@ let hasUntranslatedStrings (xlfFile:string) =
 
 let filesWithMissingTranslations =
     Directory.EnumerateFiles(baseDirectory, "*.xlf", SearchOption.AllDirectories)
-    |> Seq.filter (fun (file:string) -> file.EndsWith(".en.xlf") |> not) // the english baseline files are never translated
     |> Seq.filter hasUntranslatedStrings
     |> Seq.toList