Merge branch 'Plasma/5.14'

Messages.sh

 #! /usr/bin/env bash
-$EXTRACTRC *.kcfg >> rc.cpp
+$EXTRACTRC *.kcfg *.ui >> rc.cpp
 $XGETTEXT *.h *.cpp helpers/killer/*.cpp plugins/scenes/opengl/*.cpp tabbox/*.cpp scripting/*.cpp -o $podir/kwin.pot