eth_sign improvements backport (#4473)

* Fix postsign (#4347)

* Fix whitespace.

* Fix post sign.

* Fix message.

* Fix tests.

* Rest of the problems.

* All hail the linter and its omniscience.

* ...and its divine omniscience.

* Grumbles and wording.

* Make signing compatible with geth. (#4468)

js/src/views/Signer/components/RequestPending/requestPending.js

@@ -61,7 +61,7 @@ export default class RequestPending extends Component {
           address={ sign.address }
           className={ className }
           focus={ focus }
-          hash={ sign.hash }
+          data={ sign.data }
           id={ id }
           isFinished={ false }
           isSending={ isSending }