- added -branding-upstream subpackage

- added
libxfce4ui-4.7.6-fix-libxfce4kbd-private-buffer-overflow.patch
which fixes a buffer overflow in libxfce4kbd-private that was
causing crashes on first startup
- updated to 4.7.6
- update default shortcuts for xfce4-display-settings

- improved descriptions
- corrected categories
- removed unsupported locales
- show compiler output