Management question

Saba is a manager in a branch office of a large insurance claims company. She manage a diverse team of 15 people. One of her team member stopped in to tell her that “several of them were upset that other team members were talking in their native languages throughout the day.” Their complaint? They left it was “rude” for coworkers to speak another language at work, and it made the other team members feel excluded and uncomfortable.

What should Saba do to resolve this issue?