GUI version string includes OS and Arch

(Useful when debugging via screenshots...)

gui/index.html

@@ -326,7 +326,7 @@
                   </tr>
                   <tr>
                     <th><span class="glyphicon glyphicon-tag"></span>&emsp;<span translate>Version</span></th>
-                    <td class="text-right">{{version}}</td>
+                    <td class="text-right">{{versionString()}}</td>
                   </tr>
                 </tbody>
               </table>