Deleted obsolete Belarusian translation.
Fixed tpo in string. Fixes bug #611630
Updated Norwegian bokmål translation
[l10n] Updated Estonian translation
Updated Hungarian translation
gnome version: gnome-about was dropped and gnome-version.xml is now installed in DATADIR/gnome/gnome-version.xml.

Adjust to the changes made in gnome-desktop commit
http://git.gnome.org/browse/gnome-desktop/commit/?id=3d5bacf61fd935ec1aa0c7a515d1778b3ca31f4d

Fixes bug 682638.
Updated Serbian translation
[l10n] Updated Estonian translation