Use KLocalizedString (for i18n only, in kf5 it will necessary => use a script for...

[kdenlive] / src / audioscopes / CMakeLists.txt

set(kdenlive_SRCS
  ${kdenlive_SRCS}
  audioscopes/abstractaudioscopewidget.cpp
  audioscopes/audiospectrum.cpp
  audioscopes/spectrogram.cpp
  PARENT_SCOPE
)