Learning another language requires so much time and effort that it is almost always an effort misplaced unless the language is English.
Learning a language is a few years of hard work. I have a friend who is an assistant professor in Germany and he's toying with an idea of learning German, but he mentioned to me that he was wondering whether learning a programming language, say C++, wouldn't be a better use of his time. To which my answer was: By expanding the amount of effort required to learn to speak German, you wouldn't be able to just learn C++; the comparable thing would be to go from knowing nothing about programming, to knowing enough to be able to land a job as a Software Engineer in any company in the Silicon Valley.
What a useless point of view. English wont always be the dominant language. What will people like you do then?
Is everything a waste of time unless you can directly make money from it? Learning a language teaches you so many things. Things about your language, gives you insight into other cultures, etc., etc.
You have only this many five-years projects left to complete in this life. If you really prefer learning a foreign language to learning quantum mechanics, or computer programming, or how to play a piano, by all means don't let me stop you.
