truncate author names before they reach the install button (bug 1109819)

## Before

![screen shot 2014-12-10 at 11 50 25 am](https://cloud.githubusercontent.com/assets/674727/5383017/c7883070-8062-11e4-9e6c-00af53d1b333.png)
![screen shot 2014-12-10 at 11 50 10 am](https://cloud.githubusercontent.com/assets/674727/5383020/c7e1e82c-8062-11e4-8041-01f8023f9bae.png)


## After

![screen shot 2014-12-10 at 11 49 25 am](https://cloud.githubusercontent.com/assets/674727/5383022/ca7c2106-8062-11e4-95a4-28dd61323b07.png)
![screen shot 2014-12-10 at 11 49 54 am](https://cloud.githubusercontent.com/assets/674727/5383023/cb5cf67c-8062-11e4-9b59-f1bf65f3afe8.png)