Change font for entire photo book?

Hello,

I'm currently creating a new photo book in Aperture 3.4

I would like to change the font for the text boxes to something else.

Can this be done in one action/command?

Or is it possible to change the default font (and size) that is used?

I now have to change the font and size for every text box I want to use.

Kind regards,

emeu1