[#53420683] Updates the "Add a child during group registration" page.

![1](https://f.cloud.github.com/assets/2251119/1531862/618459a8-4c6e-11e3-8fc6-5991be97429a.png)

![2](https://f.cloud.github.com/assets/2251119/1531863/65b92c38-4c6e-11e3-926b-a9bdac2eab42.png)