Extracted from https://github.com/vector-im/riot-web/issues/9437. "Use key backup" feels like it's telling me I haven't set it up at all. "Restore from key backup" would be a better string to use there. <img width="470" alt="2019-04-12 at 10 30" src="https://user-images.githubusercontent.com/279572/56027474-09643c00-5d0e-11e9-839b-2cc4389117aa.png">
