Change remove button text for twitter

Button text was misleading as could imply will remove whole account.
Updated to be clearer.
From this

![screen shot 2014-12-13 at 14 15 04](https://cloud.githubusercontent.com/assets/4692218/5424004/3b227590-82d4-11e4-8957-ebdc1406df99.png)

To this:

![screen shot 2014-12-13 at 14 15 18](https://cloud.githubusercontent.com/assets/4692218/5424007/41c9607a-82d4-11e4-80da-be0ec70274a7.png)