Adding NeutralResourcesLanguageAttribute

src/Microsoft.AspNet.Antiforgery/Properties/AssemblyInfo.cs

@@ -2,8 +2,10 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Reflection;
+using System.Resources;
 using System.Runtime.CompilerServices;
 
 [assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]
 [assembly: InternalsVisibleTo("Microsoft.AspNet.Antiforgery.Test")]
 [assembly: AssemblyMetadata("Serviceable", "True")]
+[assembly: NeutralResourcesLanguage("en-us")]