FE/Qt: language string updates.
FE/Qt4-OSX: fix the translation of the application menu
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
Updated Finnish, Romanian, Portuguese (Brazil), Catalan, Japanese, Serbian, Italian, Portuguese, Korean, Swedish and French translations for 1.6.
FE/Qt: Updated Finnish translation.
FE/Qt: Updated Finnish and Traditional Chinese translations.
FE/Qt: Updated Finnish and French translations.
FE/Qt: Updated Swedish translation; Added Hungarian and Finnish translations.