The U.S. Catholic bishops’ film office said it will change its moral ratings for features aimed at adult audiences to respond to what it called increased violence, sexuality, dirty language and adult themes onscreen. In the church’s system of guidance to consumers, the “A-IV” rating designating films appropriate for “adults, with reservations,” will be replaced Nov. 1 by the label “L,” for “limited adult audience,” defined as a movie that contains “problematic content many adults would find troubling.”