It uses qsTr. I /think/ Diane had some fixes for that
Git commit 2e1fb349abf991ace3b9ad9685c465f06adff1e2 by Diane Trout. Committed on 03/09/2014 at 05:41. Pushed by dtrout into branch 'master'. Change to KDE i18n() function for text strings. REVIEW: 120043 M +5 -5 src/qml/core/Toolbar.qml http://commits.kde.org/telepathy-call-ui/2e1fb349abf991ace3b9ad9685c465f06adff1e2