update german translation

this string was untranslatable. thanks to siilimestari for pointing that out

don't flash frontend on hilight - while in-game

fix pas2c(?)

remove unimplemented ban action from user context menu

fix some indentation

fix view limits in stereo 3d

fix for issue #234 - the framebuffers for side-by-side and top/bottom had alpha channels. so when sprites with alpha were blended into the framebuffer it would blend the sprite pixel alpha with the fb pixel alpha