On Africa 54:  Pope Francis is set to travel to the Democratic Republic of Congo, but before embarking on his trip he called on all Catholics in the central African nation to register to vote and hold the country’s election body to account.  U.S. Treasury Secretary Janet Yellen Friday wraps up her trip to Africa with a series of engagements with authorities in South Africa. For this and more, stay tuned to VOA's Africa 54 !