If Konsole isn't told specifically not to (via the environment variable list in the profile settings area), it sets $LANG to en_US.US-ASCII when launched, overriding the default locale. Reproducible: Always Steps to Reproduce: 1. Edit the current Konsole profile, setting at least one environment variable and not setting $LANG. Apply your changes. 2. Open a new tab 3. Check $LANG Actual Results: $LANG is en_US.US-ASCII Expected Results: $LANG should be en_US.UTF-8, which is the only locale generated on the system and the only one uncommented in /etc/locale.gen and specified in /etc/locale.conf. An incorrect $LANG, especially if that locale doesn't exist on the system, causes problems for mandb, among other things. I first noticed it because mandb errored when installing packages via pacman.
There is no such string in Konsole, so that value comes from the configuration files. Please report this issue to the bug tracker of your distribution.