You should be able to set the adjectives for colonial nations, both because it's a nice flavour choice and because sometimes the set adjectives are just absolutely awful and make no sense given the names of the colonial nation (I like doing stuff like the "Vinland Confederation" or whatnot and then having the adjective "Vinland Confederation" is very silly, even just "Vinland is stupid and I should be able to set it to Vinlander without having to saveedit).