Most of the time the qm files are fro languages other than English. The conversion from Japanese to English is done by removing the Japanese .qm files so that qtopia is forced to use the default labels, menus etc. These are usually in English, however if the applications were made by non-native English speakers (or lazy native English programmers) then you get some innovative uses of the English language.
In the C760, C860 and C1000 Japanese roms there were no English qm files, just Japanes ones.
Stu