Add an indicator that Pressero is actually duplicating a product

When I click the Duplicate button to create a new product, there is nothing to indicate that the product is actually being duplicated. I know that many times this process completed very quickly, but there are plenty of times where there is a significant delay to complete the duplication. Adding a simple modal overlay with a static spinning image would suffice.

Additionally, when the system completes duplicating a product, a message "Duplication Successful" is displayed in an alert box. It would be great if that alert box goes away if I click duplicate again. That way I won't have to guess if it is complete, yet.