Log Message:
Update to 2.8.15:

Overview of Changes from GTK+ 2.8.14 to GTK+ 2.8.15
===================================================

* Bugs fixed:
 334098 Keys P and N in "open file" dialog have special meaning
        [Torben Putkonen]
 333372 MS-Windows theme (GTK-Wimp) shows all funky characters
        [Dom Lachowicz]
 163724 Optimize gdk on win32 [John Ehresman]
 332662 Hollow polygons have wrong linecaps [Tor Lillqvist]
 326362 panel crash with a11y enabled [Kjartan Maraas]

* Updated translations (bg,bn,cs,eu,ro)