This is Portuguese of Portugal, not Brazil. Você conjugations are identical to those of ele and ela. You differentiate from them by using the pronoun, i.e. "Você é uma menina" (You are a girl) versus "Ela é uma menina" (She is a girl).
But it's not wrong in Brazillian Portuguese, the 2nd person still exists, and it's widely used in the south and northeast regions.
Does "És" mean "you are"?
It means "are" (singular). The "you" is implied by the conjugation.