I forget it yesterday in my post but here you have another information about the league. The season is like Brazil or some south american leagues, it starts in February (2017 season ) and ends in November.
Girabola (Angola League)
Mate, as you can see on the link you posted, there aren't so many information about the players of the league of Angola. I know this from personal experience , cause i have updated once this league. But be sure that our update team is doing their best to find all those informations needed to update this league as soon as possible.