allow too-long article labels to wrap

before
![screen shot 2014-11-25 at 11 10 50](https://cloud.githubusercontent.com/assets/867233/5181925/5dbf2b06-7493-11e4-8001-9b5fd6da6dac.png)

after
![screen shot 2014-11-25 at 11 10 25](https://cloud.githubusercontent.com/assets/867233/5181926/6163aaf2-7493-11e4-9e50-0551dc0600fc.png)

http://www.browserstack.com/screenshots/4234be98497f027c990ff9372fcaabf5400b2f23