Better message box that shows up when closing a locked tab

[now]

The message box that shows up when you're closing a locked tab can be improved in two ways.

First, the message should be made less imposing and a bit more verbose, for example:

The tab you are about to close has been locked.
Do you still want to close it?

Second, the buttons available should only be “Yes” and “No”, no “Cancel” button.

[ghisler(Author)]

The Cancel button is there only because of Microsoft. Their clever MessageBox function only closes on ESC when there is a Cancel button, not when there is a "No" button...

[now]

Ugh, that’s very true. Perhaps make it into a “OK” + “Cancel” dialog, then?