I don´t think it´s a language problem… But you can try install the English version and see what you get!
I just use the old version of jv16 (the Freeware one). It works fine, but I used just for Registry cleaning and not for temporary files. There are lots of better programs to do cleaning of files than jv16, although the jv16 is a powerfull application for Registry (unfortunatelly it becomes Shareware :'().