Use lxqt_translate_desktop() from LXQtTranslateDesktop.cmake
Use lxqt_translate_desktop() from LXQtTranslateDesktop.cmake

We were still using the one on lxqt_qt5_use.cmake

ThomasVie/lxqt-about,lxde/lxqt-about,rbazaud/lxqt-about,rysiowski/lxqt-about