A second language is always a plus, it isn't needed for aviation - except in France sometimes - but it raises the respect of your customers if they hear the pilot saying something in another language. Companies like that.
However go easy on the Brits! Non English speaking countries learn English not for the joy or interest in the language or culture, but out of necessity. Try travelling around the World doing business without speaking English (unless you're travelling to the same country on a regular basis). Furthermore, English is rammed down the throat of most people in the developed or developing World by way of computer languages, movies and pop songs. It offers a great deal more exposure to the language for those learning or improving.