The db/units/modifiers.csv has been expanded - you have to add the new lines.
config files:
Pretty much all new texts are in the boostertext.csv, so dont overwrite that one with an old DD one.
Building Cost:
You can overwrite, but that will disable production in allied countries and enable all buildings in the production screen.
You can now add brigades as you wish - so in order for that to work it must be defined whether its land / air / naval
Look at the topmost line in the unit files / brigade files
config files:
Pretty much all new texts are in the boostertext.csv, so dont overwrite that one with an old DD one.
Building Cost:
You can overwrite, but that will disable production in allied countries and enable all buildings in the production screen.
You can now add brigades as you wish - so in order for that to work it must be defined whether its land / air / naval
Look at the topmost line in the unit files / brigade files