i18n: Do not refer to parent directory from Messages.sh

Summary:
This will make file references in .po/.pot files clearer for
translators.

Test Plan: none

Reviewers: mvourlakos

Reviewed By: mvourlakos

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D19274

Messages.sh

@@ -0,0 +1,4 @@
+#! /usr/bin/env bash
+$EXTRACTRC `find app -name \*.rc -o -name \*.ui` >> rc.cpp
+
+$XGETTEXT `find app shell rc.cpp -name \*.js -o -name \*.qml -o -name \*.cpp` -o $podir/latte-dock.pot

app/Messages.sh

@@ -1,4 +0,0 @@
-#! /usr/bin/env bash
-$EXTRACTRC `find . -name \*.rc -o -name \*.ui` >> rc.cpp
-
-$XGETTEXT `find . ../shell -name \*.js -o -name \*.qml -o -name \*.cpp` -o $podir/latte-dock.pot