Localization for the Help Command (#4891)

* Localization for the Help Command

* Updated ProjModificationCommands

* Added RemoveDefinition

* Make UsageText `static readonly`

src/dotnet/commands/dotnet-help/HelpCommand.cs

@@ -8,41 +8,41 @@ namespace Microsoft.DotNet.Tools.Help
 {
     public class HelpCommand
     {
-        private const string UsageText = @"Usage: dotnet [host-options] [command] [arguments] [common-options]
+        private static readonly string UsageText = $@"{LocalizableStrings.Usage}: dotnet [host-options] [command] [arguments] [common-options]
 
-Arguments:
-  [command]             The command to execute
-  [arguments]           Arguments to pass to the command
-  [host-options]        Options specific to dotnet (host)
-  [common-options]      Options common to all commands
+{LocalizableStrings.Arguments}:
+  [command]             {LocalizableStrings.CommandDefinition}
+  [arguments]           {LocalizableStrings.ArgumentsDefinition}
+  [host-options]        {LocalizableStrings.HostOptionsDefinition}
+  [common-options]      {LocalizableStrings.OptionsDescription}
 
-Common options:
-  -v|--verbose          Enable verbose output
-  -h|--help             Show help 
+{LocalizableStrings.CommonOptions}:
+  -v|--verbose          {LocalizableStrings.VerboseDefinition}
+  -h|--help             {LocalizableStrings.HelpDefinition} 
 
-Host options (passed before the command):
-  -v|--verbose          Enable verbose output
-  --version             Display .NET CLI Version Number
-  --info                Display .NET CLI Info
+{LocalizableStrings.HostOptions}:
+  -v|--verbose          {LocalizableStrings.VerboseDefinition}
+  --version             {LocalizableStrings.VersionDescription}
+  --info                {LocalizableStrings.InfoDescription}
 
-Commands:
-  new           Initialize a basic .NET project
-  restore       Restore dependencies specified in the .NET project
-  build         Builds a .NET project
-  publish       Publishes a .NET project for deployment (including the runtime)
-  run           Compiles and immediately executes a .NET project
-  test          Runs unit tests using the test runner specified in the project
-  pack          Creates a NuGet package
-  migrate       Migrates a project.json based project to a msbuild based project
+{LocalizableStrings.Commands}:
+  new           {LocalizableStrings.NewDefinition}
+  restore       {LocalizableStrings.RestoreDefinition}
+  build         {LocalizableStrings.BuildDefinition}
+  publish       {LocalizableStrings.PublishDefinition}
+  run           {LocalizableStrings.RunDefinition}
+  test          {LocalizableStrings.TestDefinition}
+  pack          {LocalizableStrings.PackDefinition}
+  migrate       {LocalizableStrings.MigrateDefinition}
 
 Project modification commands:
   add           Add items to the project
   remove        Remove items from the project
 
-Advanced Commands:
-  nuget         Provides additional NuGet commands
-  msbuild       msbuilds a project and all of its dependencies
-  vstest        Runs tests from the specified files";
+{LocalizableStrings.AdvancedCommands}:
+  nuget         {LocalizableStrings.NugetDefinition}
+  msbuild       {LocalizableStrings.MsBuildDefinition}
+  vstest        {LocalizableStrings.VsTestDefinition}";
 
         public static int Run(string[] args)
         {

src/dotnet/commands/dotnet-help/LocalizableStrings.cs

@@ -0,0 +1,61 @@
+namespace Microsoft.DotNet.Tools.Help
+{
+    internal class LocalizableStrings
+    {
+        public const string Usage = "Usage";
+
+        public const string Arguments = "Arguments";
+
+        public const string CommandDefinition = "The command to execute";
+
+        public const string ArgumentsDefinition = "Arguments to pass to the command";
+
+        public const string HostOptionsDefinition = "Options specific to dotnet (host)";
+
+        public const string OptionsDescription = "Options common to all commands";
+
+        public const string CommonOptions = "Common options";
+
+        public const string VerboseDefinition = "Enable verbose output";
+
+        public const string HelpDefinition = "Show help";
+
+        public const string HostOptions = "Host options (passed before the command)";
+
+        public const string VersionDescription = "Display .NET CLI Version Number";
+
+        public const string InfoDescription = "Display .NET CLI Info";
+
+        public const string Commands = "Commands";
+
+        public const string NewDefinition = "Initialize a basic .NET project";
+
+        public const string RestoreDefinition = "Restore dependencies specified in the.NET project";
+
+        public const string BuildDefinition = "Builds a .NET project";
+
+        public const string PublishDefinition = "Publishes a .NET project for deployment (including the runtime)";
+
+        public const string RunDefinition = "Compiles and immediately executes a.NET project";
+
+        public const string TestDefinition = "Runs unit tests using the test runner specified in the project";
+
+        public const string PackDefinition = "Creates a NuGet package";
+
+        public const string MigrateDefinition = "Migrates a project.json based project to a msbuild based project";
+
+        public const string ProjectModificationCommands = "Project modification commands";
+
+        public const string AddDefinition = "Add items to the project";
+        
+        public const string RemoveDefinition = "Remove items from the project";
+
+        public const string AdvancedCommands = "Advanced Commands";
+
+        public const string NugetDefinition = "Provides additional NuGet commands";
+
+        public const string MsBuildDefinition = "msbuilds a project and all of its dependencies";
+
+        public const string VsTestDefinition = "Runs tests from the specified files";
+    }
+}