Add Qt-supplied qt_ar.ts corresponding to new qgis_ar.ts file. Translated About, Preferences and Quit menu items on Mac need this file. It also provides translations for all Qt library strings as well.

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@8072 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: telwertowski