3983 Escaped HTML in admin posts on home page

https://code.google.com/p/otwarchive/issues/detail?id=3983

The news listing on the home page was still showing `&lt;` and all that fun stuff because it wasn't `html_safe`. I also renamed the iteration variable from `f` to `admin_post` so next time we must do something to admin_post, it'll be easier to track down.