From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020809

Description of problem:
"gnome-terminal" or "xterm" do not display the characater "_" correctly in
"tcsh-6.12-2". For instance, instead of "|vd_", one obtains "|vd ?". 

Version-Release number of selected component (if applicable):
6.12-2

How reproducible:
Always

Steps to Reproduce:
1. Log in to GNOME session.
2. Open "gnome-terminal".
3. Type some German "umlauts".

Actual Results:  German "umlauts" do not display correctly, e.g. "|vd_" becomes
"|vd ?"

Expected Results:  One should see the text appear as it was typed.

Additional info:

Switching to "sh" or "bash" makes this erroneous behaviour disappear
instantaneously! The responsible component may of course be a different one, and
the problem may only become manifest in certain circumstances. For example,
"umlauts" are not displayed correctly by "xedit" or "gvim" either. In other
cases, e.g. "mozilla" everything is fine. I had to downgrade "glibc" to version
"2.2.90-17" because of some problem with the "umount" command.

The content of my "/etc/sysconfig/i18n" file reads

LANG="en_US.UTF-8"
SUPPORTED="en_US.UTF-8:en_US:en:es_ES.UTF-8:es_ES:es"
SYSFONT="LatArCyrHeb-16"
SYSFONTACM="utf8"

I thought I had checkmarked "French" and "German" during install, too, but they
have not been installed - another bug?
Anyway, I never added other languages to the default "American English" one in
the past, and everything always worked great in this respect.