No, there is no Braille version that comes out. In fact, the voter card feels very much like a coupon that you get for pizza, so it often gets missed by people who are blind or partially sighted, because it feels the same as every other piece of mail that comes through. It's no different from any coupon that comes to the door. When we get those, we don't often notice them right away.
Typically, someone who is blind or partially sighted will call the electoral office to find out where they have to go to vote or they will ask a neighbour. That's usually how we find out where we're supposed to go.