Well, there's an important detail here: you mean items from educational programs, not mathematics and language (for example, Russian). Undoubtedly, language was built using mathematics, and mathematics was learned using language. There isn't a main part here; they are impossible without each other. In the sense of a school program and a minimum, language education is certainly more important – in the real world, it provides much more than the ability to calculate differentials. But I also can't imagine a literate person who has no idea about mathematics – there must be some mathematical basis, which is what schools provide. In short, in the end: It's a pointless argument – one is impossible without the other. And to top it off, mathematics is a language. In fact, you can reverse this phrase – how is a cipher decoded (like a new language)? Using mathematical research on the number of symbols, their combinations, etc. Okay, I'm tired of typing. Peace out. Stop the argument.