Reduces size of message header font

Before:
![screen shot 2014-11-25 at 2 51 12 pm](https://cloud.githubusercontent.com/assets/186715/5193120/906f2f96-74b2-11e4-8944-6494c557ee21.png)

After:
![screen shot 2014-11-25 at 2 50 27 pm](https://cloud.githubusercontent.com/assets/186715/5193123/92fc356a-74b2-11e4-84ff-ab538e678199.png)