Vail Mountain School’s Middle School students will take the stage this spring in a spirited production of “Matilda the Musical,” featuring 47 students from sixth, seventh and eighth grades. Based on Roald Dahl’s beloved story, “Matilda the Musical” follows a highly intelligent and resilient young girl who, despite being neglected by her parents, discovers her own voice — and extraordinary telekinetic powers. Along the way, she forms a meaningful…