cultural differences

do all languages have a word for "maybe" in them?
similarly do all cultures have a concept for the indefinite?

These are unrelated questions. You don't need a word that means "maybe" to express the fact that something is a possibility any more than you need the word "yes" to affirm a question. I don't even know what the second question means.

probably most of them, maybe

I heard that the french don't have a word for entrepreneur because of their socialist culture

Tal vez.