JOHANNESBURG — The dance world mourned Tuesday the internationally acclaimed South African dancer and choreographer Dada Masilo, who died in the hospital over the weekend at age 39. Masilo died unexpectedly on Sunday after a brief illness, a spokesperson for her family said in a statement. Born in Soweto, she was described as a sprite-like, energetic dancer and a fearless rule-breaker, who brought African dance motifs to classic European roles in a career that spanned two decades. “Deeply respectful of European and contemporary music traditions, but unafraid to go bare on stage and voice her own opinions, she effectively changed