'English has no elegant way of expressing the difference between libre and gratis in Spanish' - 'Free as in beer' versus 'free as in speech' works for me. Also

'English has no elegant way of expressing the difference between libre and gratis in Spanish' - 'Free as in beer' versus 'free as in speech' works for me. Also, shouldn't it be 'Which programming languages should you know?' if you're concerned with linguistic elegance? (To be fair, the title may have been written by an editor rather than the author, the rest of the piece is well-written and hard to disagree with.)