Header: Make the weekday headline shorter so it won't overflow the DatePicker.

Reported-by: lhnguyenduc and bnurbekov
Signed-off by: Long Nguyen Duc Hoang <lhnguyenduc@wpi.eud> and Batyrlan Nurbekov<bnurbekov@wpi.edu>
Merge pull request #71 from hlong290494/sbl-dev

Fixed the Calendar text overflow issue