message: missing key attr
diff: @@ -283,7 +283,7 @@ module.exports = React.createClass({
  </div>,
  button: "Sign out",
  extraButtons: [
  - <button className="mx_Dialog_primary"
  + <button key="export" className="mx_Dialog_primary"
  onClick={this._onExportE2eKeysClicked}>
  Export E2E room keys
  </button>
  