The overflow layout displays "Other n events" when there are too much event that a cell can accomodate. But on rtl languages, due to the layering out of the cell, the position of the overflow is not renderend on the mirrored date. We fix that by mirroring the positon of the day on which the events occur so that the events can appear on the right day. https://bugzilla.gnome.org/show_bug.cgi?id=777427