The U.S. comic books were issued in at least three additional languages.  Eleven of the twelve were issued in German, and two of the twelve were issued in Swedish.  At least four of the comics were issued in Dutch; I have copies of three of them.

The German comic books changed the colors in the cover illustrations, and the size of the comic book is a larger format, about the size of a magazine.  The Dutch comic books are the same size as the U.S. editions and have the same colors in the cover illustrations.

Below are links to scans of all of the comic books I have found.  The scans of the Swedish editions are courtesy of a Swedish fan.