The creator and author of translated pages is XWikiGuest instead of the user who launched the translate action

Steps to reproduce

As a logged in user, translate a page to a target language.

Expected result

The last author of the translated page should be the current user.

Actual result

The last author shown is XWikiGuest, which is a severe issue, in particular for pages which contain scripts: the translation will display an error since XWikiGuest is typically not authorized to execute scripts.