I noticed that the pattern groups in Agama are not translated, although the
pattern names and the descriptions are. See the screencast in
https://github.com/openSUSE/agama/pull/991.

YaST has the same issue, I can see the translated pattern names and
descriptions, but the pattern categories are not translated. (Go to View ->
Patterns)

I verified that the groups are correctly translated in the *-susedata.cs.xml.gz
repository metadata file. For example it contains <pattern-category
lang="cs">Grafická rozhraní</pattern-category> for the
"patterns-kde-kde_plasma" package.

That file also contains the translated pattern names and descriptions which are
used correctly. So it seems that just the pattern groups are not read properly.

I can reproduce the problem in YaST also in Leap 15.4 and 15.5, so it seems
that also some older products are affected. (Very likely including SLE15, I
haven't checked that.)