“ Michael ” is nearing another major box office milestone. The musical biopic about Michael Jackson has generated $788 million globally and will soon eclipse the $800 million mark. Over the weekend, “Michael” added $28.5 million overseas in another strong showing. The crowd-pleaser, distributed by Universal internationally and Lionsgate domestically, has grossed $468 million overseas and $319 million domestically to date. With one significant market — Japan — yet to open, “Michael” should