Minor improvements on notifications mechanism

Packages/ohif-core/client/components/bootstrap/dialog/form.html

@@ -14,7 +14,7 @@
                     {{#unless this.hideCancel}}
                         {{#button action='cancel'
                             disabled=this.cancelDisabled
-                            class=(concat 'btn btn-cancel ' (choose this.cancelClass 'btn-default'))
+                            class=(concat 'btn btn-cancel ' (choose this.cancelClass 'btn-secondary'))
                             tagAttributes=(extend this.tagAttributes data-dismiss='modal')
                         }}{{choose this.cancelLabel 'Cancel'}}{{/button}}
                     {{/unless}}