[a follow-up to bug 1123478]

People might have a non-UTF-8 locale in /etc/sysconfig/language::RC_LANG,
e.g. "de_DE" with ISO-8859-1 or even weirder things like "de_DE@euro" using
ISO-8859-15.

The problem here is that yast might need to read system files in that encoding
while it itself runs in UTF-8 during the upgrade process (in the installation
system). Worse, not all system files might follow this locale setting and
might stick to UTF-8 anyway. (YaST even copies system files between
installation system and target system.)

That's a hopeless mix of encodings and imho not really worth the trouble as
UTF-8 is the default in almost all cases.

But maybe yast could issue a warning when it detects this situation.