Make dt metadata tag wider

With the introduction of the DFID finder we have some longer <dt> tag that wrap over two lines. This commit makes the <dt> a bit wider to account for this. Screenshots:

Before: 
![screen shot 2014-08-01 at 11 32 55](https://cloud.githubusercontent.com/assets/449004/3777803/9969ceb8-1967-11e4-9f27-2eaef41772b1.png)

After:
![screen shot 2014-08-01 at 11 35 56](https://cloud.githubusercontent.com/assets/449004/3777805/a5b7d5f2-1967-11e4-8454-a38d90ab8b93.png)