Use Culture Specified by User in case it differs with that of OS

src/datacollector/DataCollectorMain.cs

@@ -14,6 +14,7 @@ namespace Microsoft.VisualStudio.TestPlatform.DataCollector
     using Microsoft.VisualStudio.TestPlatform.ObjectModel;
     using Microsoft.VisualStudio.TestPlatform.ObjectModel.Logging;
     using Microsoft.VisualStudio.TestPlatform.PlatformAbstractions;
+    using Microsoft.VisualStudio.TestPlatform.Utilities;
     using PlatformAbstractions.Interfaces;
     using CommunicationUtilitiesResources = Microsoft.VisualStudio.TestPlatform.CommunicationUtilities.Resources.Resources;
     using CoreUtilitiesConstants = Microsoft.VisualStudio.TestPlatform.CoreUtilities.Constants;
@@ -140,6 +141,23 @@ private void WaitForDebuggerIfEnabled()
             }
         }
 
+        private static void SetCultureSpecifiedByUser()
+        {
+            var userCultureSpecified = Environment.GetEnvironmentVariable("DOTNET_CLI_UI_LANGUAGE");
+            if (!string.IsNullOrWhiteSpace(userCultureSpecified))
+            {
+                try
+                {
+                    CultureInfo info = new CultureInfo(userCultureSpecified);
+                    CultureInfo.DefaultThreadCurrentUICulture = info;
+                }
+                catch (Exception)
+                {
+                    ConsoleOutput.Instance.WriteLine(string.Format("Invalid Culture Info: {0}", userCultureSpecified), OutputLevel.Information);
+                }
+            }
+        }
+
         private void StartProcessing()
         {
             var timeout = EnvironmentHelper.GetConnectionTimeout();

src/testhost.x86/Program.cs

@@ -6,7 +6,7 @@ namespace Microsoft.VisualStudio.TestPlatform.TestHost
     using System;
     using System.Collections.Generic;
     using System.Diagnostics;
-
+    using System.Globalization;
     using Microsoft.VisualStudio.TestPlatform.CoreUtilities.Helpers;
     using Microsoft.VisualStudio.TestPlatform.CoreUtilities.Tracing;
     using Microsoft.VisualStudio.TestPlatform.ObjectModel;
@@ -52,6 +52,7 @@ public static void Main(string[] args)
         public static void Run(string[] args)
         {
             WaitForDebuggerIfEnabled();
+            SetCultureSpecifiedByUser();
             var argsDictionary = CommandLineArgumentsHelper.GetArgumentsDictionary(args);
 
             // Invoke the engine with arguments
@@ -103,5 +104,22 @@ private static void WaitForDebuggerIfEnabled()
                 Debugger.Break();
             }
         }
+
+        private static void SetCultureSpecifiedByUser()
+        {
+            var userCultureSpecified = Environment.GetEnvironmentVariable("DOTNET_CLI_UI_LANGUAGE");
+            if (!string.IsNullOrWhiteSpace(userCultureSpecified))
+            {
+                try
+                {
+                    CultureInfo info = new CultureInfo(userCultureSpecified);
+                    CultureInfo.DefaultThreadCurrentUICulture = info;
+                }
+                catch (Exception)
+                {
+                    ConsoleOutput.Instance.WriteLine(string.Format("Invalid Culture Info: {0}", userCultureSpecified), OutputLevel.Information);
+                }
+            }
+        }
     }
 }

src/vstest.console/Program.cs

@@ -4,6 +4,7 @@
 namespace Microsoft.VisualStudio.TestPlatform.CommandLine
 {
     using System;
+    using System.Globalization;
     using Microsoft.VisualStudio.TestPlatform.Utilities;
 
     /// <summary>
@@ -36,7 +37,26 @@ public static int Main(string[] args)
                 System.Diagnostics.Debugger.Break();
             }
 
+            SetCultureSpecifiedByUser();
+
             return new Executor(ConsoleOutput.Instance).Execute(args);
         }
+
+        private static void SetCultureSpecifiedByUser()
+        {
+            var userCultureSpecified = Environment.GetEnvironmentVariable("DOTNET_CLI_UI_LANGUAGE");
+            if(!string.IsNullOrWhiteSpace(userCultureSpecified))
+            {
+                try
+                {
+                    CultureInfo info = new CultureInfo(userCultureSpecified);
+                    CultureInfo.DefaultThreadCurrentUICulture = info;
+                }
+                catch(Exception)
+                {
+                    ConsoleOutput.Instance.WriteLine(string.Format("Invalid Culture Info: {0}", userCultureSpecified), OutputLevel.Information);
+                }
+            }
+        }
     }
 }