[FIX] port Xavier Fernandez's fix for Bug #971412: Translations export has no fixed order
[REF] avoid the lookup in sorted translation export as suggested by Guewen Baconnier @ Camptocamp
[MERGE] Merge branch lp:~numerigraphe/openobject-server/7.0-translation-order-933496-numerigraphe
Merge branch 'master' of bzr::lp:openobject-server