I think there could maybe a special game mode in the options that "simplifies" the game. (similar to friend and foe colors) In which the units could be given a generic name substitute instead of the ethnic name. A Peltastes Thrakikos would be a "Thracian Peltast" or a Gaesata would be a "Celtic Spearman". This might be something to consider, as I personally see the use of ethnic names in general as a two-edged sword: whilst it gives truly historical flavor to the game, it may also confuse people. (I, for myself, am fairly familiar with anything Latin, Greek or Spanish, but I frown upon the names of the Persian or Carthaginian units.)