Protip: Once you have your game installed, instead of looking through the encyclopedia ingame, just open this path in your browser and enjoy:
file:///C:/Program%20Files%20%28x86%29/Steam/SteamApps/common/Total%20War%20Rome%20II/data/encyclopedia/en/units/faction/rom_scordisci.html
This way you can do other stuff in the meantime.