The wild horse hero doesn’t sing, or joke, or even talk (his thoughts are delivered by a plainspoken Matt Damon), and that barely verbal quietude stands the movie in good stead. Spirit, a solemn neo-”Bambi,” has been made with simple, elegant conviction. The filmmakers have figured out how to give traditional ”2-D” animation the visual dynamism of CGI. None of this would matter, though, if the tale didn’t draw us into its born-to-roam-free spell. Spirit, captured by Union soldiers, fights to stay a beautiful unbroken beast, and there is scarcely a kid in the audience who won’t relate to his quest.