There're two feats that can help, though spending feats for linguistics is only going to be useful in a certain kind of campaign. The first is called, I think, master linguist and it gives you a new language at every level without spending points. The other is called smatterings, which allows you to make an intel check to get a basic grasp of a language after a short time of exposure, but only temporarily. The former is in either ECS or RoE, and the latter is in RoD.