Greetings from Germany
First I Love Simple Press the best Forum for WordPress, i used that Great Plungin now 1 Year.
So i testing now on my site http://ps3info.de/ the new version of simple press 5
(i hope the Germany version comes soon)
but i missing the Recent post widget to show the new forum post on the main site.
is that witget away or so?
(sry for my not so good english)
You need the Template Tags plugin for the widget.
Take a look here about getting it and showing the widget.
http://codex.simple-press.com/codex/simplepress-api/functions-and-tags/widgets/
If you are looking for a German translation then take a look here about language files.
http://codex.simple-press.com/codex/installation/installation-information/localization/