reset confirm text for alertify

www/common/common-interface.js

@@ -56,7 +56,9 @@ define([
             findOKButton().click();
         };
         var keyHandler = listenForKeys(close, close);
-        Alertify.alert(msg, function (ev) {
+        Alertify
+            .okBtn(Messages.okButton || 'OK')
+            .alert(msg, function (ev) {
                 cb(ev);
                 stopListening(keyHandler);
             });