AuthFormHandler: Show the <message> prompt from the auth dialog XML

This might contain important information; for instance, Entrust grid
authentication uses it to display the coordinates.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Update changelog and bump version to 0.95-beta2 (952)

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>