Respect attribute `data-class-on-change` on save buttons.

mockup/personmock.html

@@ -91,7 +91,8 @@
         <div class="col-md-2 ">
             <div class="btn-toolbar pull-right" role="toolbar">
                 <div class="btn-group" role="group">
-                    <button id="save-button" type="button" class="btn btn-default navbar-btn"><span
+                    <button id="save-button" type="button" class="btn btn-default navbar-btn"
+                            data-class-on-change="wdc"><span
                             class="glyphicon glyphicon-ok"></span></button>
                     <button id="close-button" type="button" class="btn btn-default navbar-btn"><span
                             class="glyphicon glyphicon-remove"></span></button>