Fix the display of long CMS menu item titles.

Before:
![collapsed before](https://f.cloud.github.com/assets/31570/1217461/62b59b8a-26a7-11e3-9759-941b276e6833.png)
![expanded before](https://f.cloud.github.com/assets/31570/1217462/62bf491e-26a7-11e3-9094-a663703bd623.png)


After:
![collapsed after](https://f.cloud.github.com/assets/31570/1217463/692a9fec-26a7-11e3-935f-32ec6c02065c.png)
![expanded after](https://f.cloud.github.com/assets/31570/1217464/6963c90c-26a7-11e3-96c1-fcd7fccd8a64.png)


Tested in:

* Firefox 23
* Chrome 29
* IE 10, 9, 8