removes extra space from email sign-up alerts

@boonrs @drewrwilson 

Removes extra space before alert title in the email sign-up form. Example of the extra space below:
![screenshot 2014-07-08 15 25 20](https://cloud.githubusercontent.com/assets/6335546/3517495/28927878-06ef-11e4-9694-78b5720eb51c.png)