increases width of the date label for comments

Before:

![ios simulator-1](https://f.cloud.github.com/assets/1220715/1758006/66682f6a-6688-11e3-8786-d70b936654f5.jpg)

After:

![ios simulator-2](https://f.cloud.github.com/assets/1220715/1758007/6abbf9e8-6688-11e3-8463-14e6abe68bbe.jpg)