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

[kdenlive] / src / onmonitoritems / CMakeLists.txt

set(kdenlive_SRCS
  ${kdenlive_SRCS}
  onmonitoritems/onmonitorcornersitem.cpp
  onmonitoritems/onmonitorrectitem.cpp
  onmonitoritems/onmonitorpathitem.cpp
  PARENT_SCOPE
)