They are located in To End All Wars\EAW\GameData\Factions\
I tried to change German color on mini map from those barely visible grey to their alternate light violet
It was:
Color = $colGERMain
Secondary Color = $colGERAlternate
MinimapColor = $colGERMain
Now I have:
Color = $colGERMain
Secondary Color = $colGERAlternate
MinimapColor = $colGERAlternate
but strangely mini map is still in grey, any help?
Ps: I even tried to change colors of units, but they are grey on mini map despite their violetness