Comment # 16 on bug 1222314 from Fabian Vogt

I found it!

Initially I thought that "size 6" was indicative of a wrong file and it needs
to be "size 70", but both are actually fine. It's also not the installation
that is at fault here, so the cause is not visible in the attached installation
logs.

I grepped for RequestedLocales in all of /var/log and found that in the y2log
after installation it wrote a file with "size 67" once, which matches exactly a
file with no entries. This was caused by using the one-click-installation file
for installing ca-certificates-suse. I removed the package and repo and
performed the one click install again and that reproduced the issue - my
configured locale was gone. The .ymp doesn't look unusual, it adds a repo,
installs two packages and removes one. I guess the YaST one-click-install
handler doesn't read the locale info properly for some reason so libzypp writes
an empty config back.

y2log will be attached shortly.