If you downloaded DisplayFusion 12.0 and are having issues with languages please re-download and re-install. We have repacked the release as 12.0c with the languages fixed.
I'm hitting a weird behavior in the latest beta if I have enough windows open so that the preview stretches across the entire screen width. If I hover anywhere over the preview window, it grows by 10-15px jumps every second or so. If I leave my mouse there, the preview window can get quite large.
We'll hopefully have it resolved for the next Beta version.
