On Startup K3b (Source Package: k3b-18.08.3-1.1 from openSUSE-Tumbleweed-Oss)
complains:

"System locale charset is ANSI_X3.4-1968
Your system's locale charset (i.e. the charset used to encode filenames) is set
to ANSI_X3.4-1968. It is highly unlikely that this has been done intentionally.
Most likely the locale is not set at all. An invalid setting will result in
problems when creating data projects.
Solution: To properly set the locale charset make sure the LC_* environment
variables are set. Normally the distribution setup tools take care of this."

It results in ripped media files that are unreadable by some programs (e.g.
Amarok), probably due to incorrectly encoded filenames or tags.

My system:
Operating System: openSUSE Tumbleweed 20181203
KDE Plasma Version: 5.14.3
Qt Version: 5.11.2
KDE Frameworks Version: 5.52.0
Kernel Version: 4.19.5-1-default
OS Type: 64-bit
Processors: 8 �� Intel�� Core��� i7-4770 CPU @ 3.40GHz
Memory: 15,6 GiB of RAM

My actual LC_* environment variables:

> set | grep "LC_"
LC_CTYPE=en_GB.UTF-8
LC_MONETARY=en_NL.UTF-8
(.... lots of macro lines using these variables ....)