Issue #2803203 by lodey, lomasr, tkoleary, AndreaD, yoroy, joachim, xjm, ifrik: Simplify the descriptions of "menu levels" in the menu block plugin

Revert "Issue #2570681 by juanse254, AndreaD, giancarlosotelo, lucastockmann, edurenye: when admin toolbar-oriented vertically a div is over the options"

This reverts commit 2acfed87.

Issue #2570681 by juanse254, AndreaD, giancarlosotelo, lucastockmann, edurenye: when admin toolbar-oriented vertically a div is over the options