"Habari gani" it is kind of greeting
Can i say "How's the news?"
How is it going? Is a better English translation. What is new? Noone says what news?
"What news" is a terrible translation! Habari gani does not mean 'what news'. It can be translated with various combination of words as long as it means WHAT'S NEW, WHAT'S THE NEWS, HOW ARE YOU, and similar