See http://android.pleco.com/manual/310/vershist.html for changes.
I fully agree - I always use night mode because I have difficulties to see light grey on dark white and similar combinations. The bigger the contrast the better for me, therefore I prefer white on black, as it was used until 3.2.26 in dictionary and flashcards.lots of people complaining that the white strokes were too hard to see against white text)