There is no questioning Bulls forward Nikola Mirotic’s intelligence. He recently added Greek to the handful of languages he speaks. When Mirotic was asked last week about learning Greek, he replied: ‘‘It’s a hard language, so why not?’’ Mirotic now is fluent in Serbian, Greek, Spanish, English and passive-aggressiveness. It’s the last one he has displayed masterfully in the last two weeks. To say Mirotic has walked the fine line between being a team guy and sounding like the ultimate self-promoter since making his season debut Dec. 8 is an understatement.