“ Learning French won't be very helpful if you later need to learn Korean, but programming languages are not like that. It's easy to switch programming languages.”

However, learning a second human language makes it easier to learn a third (or fourth, or fifth…), the earlier the better. Completely anecdotal, but my Hungarian-Romanian colleagues all picked up German and/or English extremely quickly and completely. Growing up speaking two completely different languages must have something to do with it.