FE/Qt: language string updates.
FE/Qt4-NLS: update sv, pt
FE/Qt4-OSX: fix the translation of the application menu
FE/Qt4-NLS: Merged Polish, Catalan, Spanish, Swedish, Italian & Bulgarian.
FE/Qt4-NLS: Updated Bulgarian, Serbian, Danish, Italian, Swedish, Brazilian Portuguese.
FE/Qt4-NLS: Updated Swedish, Ukranian & Brazilian Portuguese.
FE/Qt4-NLS: updated qt_* translation files to 4.4.3
FE/Qt-NLS: Updated Slovak, Czech, Hungarian, Romanian, Turkish, Finnish, Catalan, Italian, Swedish translation files.
renamed VirtualBox4 to VirtualBox
purge the obsolete Qt3 GUI
FE/Qt: Corrected syntax of some qt_xx translations.
FE/Qt: Updated Swedish translation; Added Hungarian and Finnish translations.
FE/Qt: Added Swedish translation.