I have created a custom ribbon button following the steps mentioned in http://jondjones.com/how-to-add-a-custom-sitecore-button-to-the-editor-ribbon/
I can see the button appearing in sitecore:
Command does not get triggered when clicked on the button.
Below is my code:
using System;
using Sitecore.Shell.Applications.Dialogs.ProgressBoxes;
using Sitecore.Shell.Framework.Commands;
namespace SitecoreVsPoc.Commands
{
    public class TranslateContent : Command
    {
        private static readonly object Monitor = new object();
        public override void Execute(CommandContext context)
        {
            if (context == null)
                return;
            try
            {
                ProgressBox.Execute("Arjun", "Title", "Applications/32x32/refresh.png", Refresh);
            }
            catch (Exception ex)
            {
                Sitecore.Diagnostics.Log.Error("Error!", ex, this);
            }
        }
        public void Refresh(params object[] parameters)
        {
            // Do Stuff
        }
    }
}
Below is the command I have registered in commands.config:
<command name="contenteditor:translatecontent" type="SitecoreVsPoc.Commands.TranslateContent,SitecoreVsPoc" />
Note: I am using Sitecore 8.2 initial release.
Can someone suggest a solution for this?

contenteditor:translatecontentin the button's Click field within Sitecore? - Adrian Sanguineti