Lemon Poppy Seed Braided Bread

Name: Lemon Poppy Seed Braided Bread
Ingredients: For the bread:; 3/4 cup milk, warm; 1/4 cup granulated sugar; 1/2 cup unsalted butter, melted; 2 1/2 teaspoons granulated active dry yeast; 2 eggs, lightly beaten; 1/4 teaspoon fine salt; 1 teaspoon vanilla extract; 3 1/2 cups all- purpose flour; For the filling:; 5 tablespoons poppy seeds; 4 tablespoons light brown sugar; 2 tablespoons plain flour; 1 teaspoon ground cinnamon; 1 tablespoon lemon zest; 2 tablespoons lemon juice; 1 egg white, beaten until fluffy; 2 tablespoons milk; icing sugar; eggwash