This allows to collaborate on new revised translations, while still having the last agreed "productive" translation present in the APIs.

Then you know the last official published verson of the text, but have a draft, that can be modified until it is "published" again.

Currently a text in status "proofread" is there but once changed (because in discussion) the last "proofread" version is not accessible.

Setting proofread will then copy the current text into the official "published" version.