Language movement hero Rawshan Ara Bachchu died at a hospital in Dhaka this morning. Rawshan, who was undergoing treatment at Apollo Hospital, was declared dead around 11:00 am, Md Ashraful, duty manager of the hospital, told The Daily Star.   She had been suffering from her old-age complications for several days, Tahmida Khatun, daughter Rawshan Ara Bachchu, told Bangla daily