Be sure you have the en_US.UTF-8 locale installed on your system. To check current locale settings in various categories, use the locale(1) utility.
system% locale LANG=en_US.UTF-8 LC_CTYPE="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_TIME="en_US.UTF-8" LC_COLLATE="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_MESSAGES="en_US.UTF-8" LC_ALL=
To use the en_US.UTF-8 locale desktop environment, choose the locale first. In a TTY environment, choose the locale first by setting the LANG environment variable to en_US.UTF-8, as in the following C-shell example:
system% setenv LANG en_US.UTF-8
Make sure that the LC_ALL, LC_COLLATE, LC_CTYPE, LC_MESSAGES, LC_NUMERIC, LC_MONETARY, and LC_TIME categories are not set, or are set to en_US.UTF-8. If any of these categories is set, they override the lower-priority LANG environment variable. See the setlocale(3C) man page for more details about the hierarchy of environment variables.
You can also start the en_US.UTF-8 environment from the CDE desktop. At the CDE login screen's Options -> Language menu, choose en_US.UTF-8.