Suggest "PACSé" or "Marié" instead of "Célibataire" when foyer_fiscal contains 2 "declarants" without "statmarit".
Revert "Use numeric IDs for new "familles", "foyer-fiscaux" & "ménages" instead of uuid."

This reverts commit 2f4012e65edb778c951bccbc8ac78153f5ece81a.
Add i18n.
Don't modify a scenario when creating a simulation from it.
Creating SurveyScenario class