When deleting an Import/Export Mapping, a confirmation message appears with the message: "WARNING : Are you sure you want to delete <Mapping Type>? This action can not be undone." This does not give good confirmation, since there may be multiple mappings with the same type.
To recreate on the Demo:
1. On the CiviCRM Adminstration page, go to Import/Export Mappings
2. Click the delete link for a mapping
View the message as described above.
The message should be changed to list the mappings NAME rather than TYPE.