The topics with only one posts appears a bit strange. See how it is in the previous version (from sporenbiolog.no).
Wouldn't it be better to say: last post by "the username who posted the topic" or just take the last-post-part away?
Postet den
Thanks! (I wasn't sure if you agreed on this one)
Postet den
fixed here
Postet den
But we need arrow in both cases. I always click on the arrow