The issue I met was with some local fixture: I had an `Addon` with `pk: 1, slug: "status-watch"` and a `Review` with `pk: 12`.
It replaced the url `reviewers/1/12/translate/fr` to `reviewers/status-watch/status-watch2/tranlate/fr`.
Headache until finding it and the patch cvan suggests would not solve this case.