Contents of combobox "Change layout option:" and "Compose key position:" are not translatable. Version: 0.5.3.2 (trunk) Build & Platform: Build 2009-02-04 on Arch Linux
The contents of these comboboxes are retrieved from the xklavier library, which (afaik) reads them from an xml file from the xkb-data package. I'm not sure what is the best solution to this one.
Marking the bug as wontfix, I suppose a bug should be filed for the libxklavier package.