Defining yourself by your languages also encourages the guys with money to consider you a trivially substitutable commodity, equivalent to any other "resource" with the same keyword set. You probably don't want that.
I was just in a meeting with a company who wants to
license our software. They have hundreds of developers all over the world. They were happy to discuss architecture and business cases with me, but the one sentance where they mentioned my two best language skills was when they said they could "ramp up development over seas for a couple months."