In a WH-question where the question word is not the subject, we always put the auxiliary before the subject, introducing a form of do as auxiliary if there isn't already one.
How many languages do you speak?
In very informal speech, the auxiliary (do, are etc) is sometimes inaudible, or very nearly so; but in more careful speech it is always there.
A point you didn't ask about: language is a count noun, so you appropriately used how many rather than how much. But how many is always followed by a plural: how many languages, not how many language.