Improved warning when attempting to delete an asset

I am trying to free up as much space as possible for more assets in the art manager, however when I go to delete an asset it is not easy to confirm that an asset is not in use in any of my maps.

Some clarification when attempting to delete an asset would be nice. A generic message about deleting not being reversible and confirming an asset is not in use would be nice, even better would be the ability to see which maps contain the asset in question.