"dpkg-reconfigure locales" didn't work for me with the karmic image.
But i changed LANG in /etc/environment and used "localedef -i de_DE -f UTF-8 de_DE" to get rid of the language related warning.

Unfortunately debwm/qobi-wmhint-fix give me: Xephyr cannot open host display. Is DISPLAY set? xephfocus/set-focus is working, but i'm loosing focus when i switch to Maemo. Any suggestions how to fix?