devices-tile: Use getter function for duplicated localised message
devices-tile: Use getter function for duplicated localised message

Fixes: http://bugs.meego.com/show_bug.cgi?id=2002

meego-netbook-ux/meego-panel-devices,meego-netbook-ux/meego-panel-devices,meego-netbook-ux/meego-panel-devices