[RFC] Show values of string settings with button controls

@Montellese, I know this isn't 100% correct.  There are other instances of string type settings with button type controls that generate actions which clearly shouldn't display their values.  However, @davilla's network manager PR is going to need this facility to display the connection name (wired, wifi AP, etc).  Would adding an attribute (ie. "hidevalue") be the correct way to move forward?