message: SignUpButton: change mobile button icon
diff: @@ -39,7 +39,7 @@ const SignUpButton = ({ mobile }) => (
  </span>
  </ReactTooltip>
  <button styleName="buttonMobile" onClick={handleSignUp} /* eslint-disable-line */ >
  - <i className="fa fa-gift" aria-hidden="true" />
  + <i className="fa fa-bell" aria-hidden="true" />
  </button>
  </Fragment>
  )
  