/usr/share/kde4/apps/plasma/packages/org.kde.active.launcher/Messages.sh is in plasma-active-data 2.0+git2012021101-0ubuntu4~ppa3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #! /usr/bin/env bash
$XGETTEXT `find . -name \*.qml` -L Java -o $podir/plasma_package_org.kde.active.launcher.pot
rm -f rc.cpp
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