Mail title displayed twice

In the new mail preview tab in the`feature_public_trial` branch the mail title currently gets displayed twice:

![bildschirmfoto 2014-07-28 um 11 53 09](https://cloud.githubusercontent.com/assets/485755/3718939/1399930e-163d-11e4-9387-c0149bc68005.png)

The second title (part of the preview) should be dropped.