Code review comment for lp:~widelands-dev/widelands-website/more_latest_posts

Added some nits for strings and comments.

The grouping doesn't work properly. In

http://alpha.widelands.org/forum/latest_posts/?days=400&sort_by=forum

I see the "Germany" forum twice and the topic "Na dann gucken wir mal wie das hier ist" 3 times.

In http://alpha.widelands.org/forum/latest_posts/?days=400&sort_by=topic, I see the same topic listed multiple times as well.