Eg: I translated 2 message to hi, 2 messages to ta, came back after 2 days, I see 2 messages in hi(since the language chosen is hi).
Ideally the returning translator should see all his/her translations from past in the translationstash.
We may also consider some UX changes to address this case.
(Noted after https://gerrit.wikimedia.org/r/#/c/90089/ )