FE/Qt: language string updates.
FE/Qt: updated NLS prior to translation of 4.3.
FE/Qt: updated Turkish translation - thank you Burak Yavuz!
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
FE/Qt: Added and approved Turkish translation.