on git master - open kcm - add a bunch languages - in the list view use the delegate's remove button on the right hand side to remove the languages again - for the the last language the remove button does nothing the remove button should either be disabled or the last language ought to be removable (also see bug #397974).
Git commit 88d9e8f2292b02e9ad476d1f74e6561dfddd046d by Nate Graham. Committed on 05/01/2021 at 23:18. Pushed by ngraham into branch 'master'. [kcms/translations] Don't show inline buttonsfor last list item Removing the only item makes no conceptual sense, so let's not permit it. Likewise, when there's only one item, it can't be moved to the top since it's already at the top, so let's not show that one either. FIXED-IN: 5.21 M +3 -1 kcms/translations/package/contents/ui/main.qml https://invent.kde.org/plasma/plasma-workspace/commit/88d9e8f2292b02e9ad476d1f74e6561dfddd046d
Please let the last language to be removed, so that people can restore the default system behavior. In fact my systems have no languages defined but they are localized.