We log the user id, source language, target language, source title for a publish event. But user id and source title are not logged for the campaign accept event. This makes it difficult to find whether a translation started from a campaign got published or not.
Adding these two extra fields - user id and source title will make us to do analysis on effectiveness of each campaign including the publishing status.
Refer: https://meta.wikimedia.org/wiki/Schema:ContentTranslationCTA