Fix Delete Button in Designer Component List.

The Button read “Delete Project” which is wrong. Turns out that the
“Delete” button was used in both project and non-project contexts
because it’s text read “Delete.” However when renaming to “Delete
Project” it causes the wrong message in the component designer
context. So now there are two different messages, “Delete” and “Delete
Project.”

This fixes Trac issue #550.

Change-Id: I3289ef6fe8de7ab205deec1cbad2cc52f4fa6e9f