Great! That was quick!
What does the change of OpenGL imply?
Were you also able to fix /etc/profile regarding "-su: /dev/stderr: Permission denied" ?
Meanwhile I also set up locales and didn't have any other problems, but I still need to re-install the rest of my Debian system. Will hopefully find time later today. Your fix of the "Information" problem is great! With German I didn't have this problem anyway, because "Information" was translated to "Informationen". Now it is not changed any longer, so this problem is clearly fixed completely!