Minor changes to computers table status row

* Move update status row to bottom
* make it look similar to title row.
* Use `getPastTimeString` instead of `getTimeSpanString` (which is better for languages using something like '{0} ago' instead of '{0}').

![screen shot](https://f.cloud.github.com/assets/1831569/1950558/e274e17c-814d-11e3-822f-354b636a299b.png)