If you copied all the files, you are good to go!
The differences are subtle and you won't notice anything at all unless you play as one of the factions I changed (Mali or Zimbabwe). If you go to the custom battle and select Mali, you will notice the french names (chevaliers, paysan, etc) are changed to English. If you pick zimbabwe, you will notice the names of all the units are changed. IF you see these changes, you are ready to go. Play the campaign as Mali or Zimbabwe and you will notice way more mercenaries and (north of the equator anyway) and more building effects for zimbabwe.