Correct sword prop for six units
Change the weapon of gaul infantry swordmen to (Celtic) csword, because all other Celtic swordsmen (cavalry, champions, heroes, ptol mercenaries) use it already and the spatha is a Roman cavalry sword;
Change the weapon of athen cavalry swordsmen to falcata (kopis/makhaira), a chopping sword, because ancient sources (e.g. Xenophon) emphasize cavalry used that, not a xiphos (similar to gladius or akinakes), a short stabbing sword, unsuitable for horsemen.
Patch by: @Nescio

Differential Revision: https://code.wildfiregames.com/D2033