Add a tag type name for when there are multiple tags with the same webtitle

So that this

![screen shot 2014-09-03 at 13 18 37](https://cloud.githubusercontent.com/assets/1001642/4133888/862d60a0-3364-11e4-9510-95d0f0bb9473.png)

becomes this

![screen shot 2014-09-03 at 13 18 43](https://cloud.githubusercontent.com/assets/1001642/4133890/89191c8c-3364-11e4-80b2-5188e4ef9a97.png)

Adding test to https://github.com/guardian/frontend/pull/5828

One sec.