Language spoken by about a quarter million in the Casamance region of Senegal. Also Diola (en français) and Joola or Joòla.
Ethnologue pages:
According to Michel Malherbe, "Le mandjaku (ou manjak ou mandjak), le mankanya et le papel peuvent être considérés comme des dialectes du diola."
The CNRS/LLCAN "AFRO" Tavultesoft Keyman keyboard (for AZERTY) is intended to support this language: http://www.tavultesoft.com/keyman/downloads/keyboards/details.php?KeyboardID=377&FromKeyman=0