FlatpakPermissionModel: Fix adding/removing custom D-Bus permission entries, add tests
FlatpakPermissionModel: Fix adding/removing custom D-Bus permission entries, add tests
These were (hopefully) the last cases of mis-used i18n strings during (de-)serialization of backend override data.
tests: Add test for addUserEnteredPermission
With this test we can be somehow more confident about dialog-driven UI feature that allows adding custom permission entries.