Remove “fields” from “Expand/Collapse all fields”

![expand-collapse-old](https://cloud.githubusercontent.com/assets/192853/2630408/e8b54b48-be48-11e3-8f95-36218fcdbb1e.png)

![expand-collapse-new](https://cloud.githubusercontent.com/assets/192853/2630409/eaec7e7c-be48-11e3-94a2-3a446ac52167.png)

@nilshoerrmann