Attendance: Student view of comment window - change "Cancel" to "Close"

In the Attendance tool, in a site with at least one student, create an attendance event. Click in to the attendance event and mark the student as "Absent." Click on the empty comment bubble and enter a comment. Save. Log in as the student. Navigate to the Attendance tool. Click on the comment bubble for the attendance item. Read the comment. What happens: To close the comment window, student clicks "Cancel." What I suggest: Would probably make more sense for student to click "X" or "Close" when completing a passive action.