Sign-up Tool- The text on the "synchronize to Group" and "synchronize from group" button is not visible properly

Steps: Login is instructor Click on  'Add a new meeting' with some name Create 4 time slots On the 'Meetings Summary' screen, show the 'other default settings' and select 'Create groups for timeslots' Click Publish Meeting Login as Student A to sign up to timeslot 1  Login as Student B to sign up to timeslot 2  Login back as instructor and click on the meeting. Observe the text on the buttons "synchronize to Group" and "synchronize from group"