hello

i try to migrate on 1.3.0
could you explain to me why the french translation disappeared with this release ?

The reason is that the translator didn't get it ready this time. We only include those in the release that are at least at 90%. You can use the 1.2.9 from the ticket which is about 85% so some newer stuff will be missing. It will surely get updated to 1.3 some time.