Learn Swedish: Pratar hennes make svenska? - Does her husband speak Swedish?

No! While words like my (min/mitt/mina) change to match the noun they own, third-person words like hennes (her), hans (his), and deras (their) never change form. It is always hennes, no matter what she owns.

Why doesn't the sentence use a word like "does" to ask the question?

In Swedish, you don't use do or does to ask a question. Instead, you just put the verb (pratar) before the subject (hennes make). Starting the sentence with the verb turns it into a yes/no question.

I have seen man used for husband. What is the difference between make and man?

Make specifically means husband or male spouse. Man can mean either husband or just man (a male person). Both are commonly used for husband, but make is more specific to marriage.

Why isn't svenska capitalized?

Unlike English, Swedish does not capitalize the names of languages or nationalities unless they happen to be the very first word of a sentence.