Bugfixes: lowercase links and header underlines

Two unrelated bugs:

- Lowercasing table toggle links means that we miss special cases like LPA and GOV.UK
- Having tabular numbers in the header means that we encounter that nasty Chrome on Windows bug (thanks @ianhopkinson for reporting that one)

![download](https://f.cloud.github.com/assets/121219/2481470/35b54bee-b0db-11e3-97ed-c5046a0b8133.png)