/usr/bin/lrelease-qt4
/usr/bin/lupdate-qt4
/usr/lib/x86_64-linux-gnu/qt4/bin/lrelease
/usr/lib/x86_64-linux-gnu/qt4/bin/lupdate
/usr/share/qt4/bin/lrelease
/usr/share/qt4/bin/lupdate
You may install this package on Debian with
apt-get
install qt4-linguist-tools