Friendlier font in Login and About windows

![1](https://cloud.githubusercontent.com/assets/5665732/4999713/091d7340-69e5-11e4-902a-9df89f749081.PNG)
![2](https://cloud.githubusercontent.com/assets/5665732/4999721/23b0ed4a-69e5-11e4-81aa-67c60e1d38e1.PNG)
![3](https://cloud.githubusercontent.com/assets/5665732/5000564/4f6b8bfe-69ed-11e4-8d98-7eaec371438a.PNG)