fix button width to take account of translations

we should look more generally through the app 

## before 

![image](https://f.cloud.github.com/assets/2665886/2266900/324c9f7a-9ea7-11e3-9463-7d8fcdb17fd0.png)

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## after

![image](https://f.cloud.github.com/assets/2665886/2266904/38c82ef0-9ea7-11e3-80ed-cd18561428a3.png)