- base A
- translation A: up-to-date
- change base
- base B
- translation A: outdated
- update translation
- base B
- translation B: up-to-date
- change base back
- base A
- translation A/B: outdated in any case
- no matter which translation is returned for download, it should be marked as outdated again, translation A should not just be "up-to-date" again