Cook fish according to package directions. Meanwhile, in a medium bowl stir together mayonnaise, lime peel, and lime juice. Add cabbage; stir until combined. Set aside. Hollow out top halves of each roll, leaving a 1/2-inch-thick shell. Place a fish fillet on the bottom half of each roll. Top with cabbage mixture and salsa. Sprinkle with olives and capers. Add roll tops.