Add auto champs objects at a dossier (same as PJ)

Add dynamic of Champs on the description page
Rename model 'Champs' to 'Champ'

spec/factories/dossier.rb

@@ -2,6 +2,7 @@ FactoryGirl.define do
   factory :dossier do
     nom_projet "Demande de subvention dans le cadre d'accompagnement d'enfant à l'étranger"
     state 'draft'
+
     trait :with_entreprise do
       after(:build) do |dossier, _evaluator|
         etablissement = create(:etablissement)
@@ -13,7 +14,7 @@ FactoryGirl.define do
 
     trait :with_procedure do
       after(:build) do |dossier, _evaluator|
-        procedure = create(:procedure, :with_two_type_de_piece_justificative)
+        procedure = create(:procedure, :with_two_type_de_piece_justificative, :with_type_de_champs)
         dossier.procedure = procedure
       end
     end