SUMMARY Selecting a language from the overlay list produces 2 errors in the terminal: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null — and the language does not get added to the list. STEPS TO REPRODUCE 1. kcmshell5 kcm_translations 2. "Add languages..." 3. Select any language OBSERVED RESULT No effect, log errors EXPECTED RESULT The selected language gets appended to the list SOFTWARE/OS VERSIONS Operating System: openSUSE Leap 15.1 KDE Plasma Version: 5.18.4 KDE Frameworks Version: 5.69.0 Qt Version: 5.14.1 Kernel Version: 5.6.0-2.gbf56c5b-default ADDITIONAL INFORMATION Don't know if this is related, but in all reports of this bug I've seen so far, the KCM displayed "American English (Default)" as the only language configured, even though the actual UI was in Russian.
*** This bug has been marked as a duplicate of bug 419691 ***