Where to edit the breadcrumb/archive?

This is a very neat and easy to use theme, thanks a lot!
However, I still have a question: I’m struggling to find an archive-template – or whatever equivalent it has here. I need to edit the breadcrumb (because I’m developing a multilingual site with qtranslate and need to cut out the “Posts in category”-term in the upper left of the category archive).
I can’t find it’s location, neither in the index.php, nor in the left sidebar or anywhere else, as an archive.php does not exist I guess, it’s somewhere in the includes? Maybe I’m blind or simply already to desperate.
Some help would be much appreciated. Thanks in advance!