'Changed' column is not displayed as a time field

The 'Changed' column that can be displayed in the Dashboard and in the Overviews is not rendered as a time field which means it is displayed in yyyy-mm-dd hh:mm:ss style instead of in your local date format.

![changed](https://cloud.githubusercontent.com/assets/659504/2895101/d2616dca-d55b-11e3-8dbd-1747b9db30bd.png)


This patch fixes that, and I also included two typo-related commits, feel free to apply as you see fit :dancer: