Improve "Delete" message

[jenniferward]

Currently, when you click "Delete" on any element in Muscat, the pop-up message is the same no matter where:

It should include information related to the element being deleted. This can help prevent accidently deleting the wrong thing.

Suggestions:

• Include the type of record (source, work, institution, etc.)
• Include the kind of information displayed in the table view (composer and title in Sources, short title, author, title in Secondary Literature)