Its simple. download the DAT Editor here http://www.renevo.com/downloads/eaw/DATEditor.zip
then open the MasterTextFile and scroll to the TEXT_UNIT section.Find the entry for the unit and double click it, then change the text portion to the name you like. You can also edit the description in the TOOLTIP part.
"It may be that the old astrologers had the truth exactly reversed, when they believed that the stars controlled the destinies of men. The time may come when men control the destinies of stars." -Arthur C. Clarke
"Ideals are like stars: you will not succeed in touching them with your hands, but like the seafaring man on the ocean desert of waters, you choose them as your guides, and following them, you reach your destiny." -Carl Schurz