Articles translated with Content Translation are expected to evolve independently once they are created. However, it can be also useful to transfer important updates to the original article over time.
In order to support this, a notification can let the user know that new content is available for an article they translated. This will lead the user to the translation editor with the new content highlighted for the user to translate the new parts. These ideas are illustrated below.
Technically there may be challenges aligning the original and translated articles since they may have evolved. It may be ok to not show the full articles for this usecase, and show only the new content and the paragraphs around it for context.