Making a quality sequel can be tough, and even moreso when it’s a follow-up to a beloved modern classic. “Frozen II” has huge shoes to fill from the outset, and this second installment of the Disney animated tale of two sisters is a mostly unsuccessful adventure. Even the dazzling animation can’t make up for what’s lacking, including the absence of an instant hit song (nothing here even comes close to the brilliance of “Let It Go”), dry voice performances, and a mediocre story. When ice queen Elsa (Idina Menzel) begins hearing a strange voice calling her, she and sister Anna (Kristen Bell),...