Allow users to add a description to an application

When a user consults an application, it's not always obvious what that application does. In response, this feature would: * Automatically recuperate and populate the field with a description if it's empty * Allow the application manager to input their own description of what that application does * Allow the application manager to add any information he'd like. Please note: We have a similar feedback item that you might also find interesting too: [feedback: 24115/]