please make sure to wait before these depencencies are in openSUSE:Factory: exo-tools, libexo-1-0, exo-data, libxfce4ui-1-0, libxfce4util-tools, libxfce4util4

- added xfdesktop-fix-slow-popup-menu.patch which adds a check for
GDK_GRAB_INVALID_TIME in xfdesktop_popup_grab_available to
mitigate slow menu popups on a right mouse click (bnc#669768,
bxo#7172)

- split off -lang subpackage
- specfile cleanup

{"approve": "license and version number unchanged: 4.8.3"}