Use default format for date and datetime champ

app/models/champs/date_champ.rb

@@ -6,7 +6,7 @@ class Champs::DateChamp < Champ
   end
 
   def to_s
-    value.present? ? Date.parse(value).strftime('%d/%m/%Y') : ""
+    value.present? ? I18n.l(Date.parse(value)) : ""
   end
 
   private

app/models/champs/datetime_champ.rb

@@ -5,6 +5,10 @@ class Champs::DatetimeChamp < Champ
     # Text search is pretty useless for datetimes so we’re not including these champs
   end
 
+  def to_s
+    value.present? ? I18n.l(Time.zone.parse(value)) : ""
+  end
+
   private
 
   def format_before_save

app/views/shared/dossiers/_champ_row.html.haml

@@ -31,9 +31,9 @@
             - when TypeDeChamp.type_champs.fetch(:textarea)
               = render partial: "shared/champs/textarea/show", locals: { champ: c }
             - when TypeDeChamp.type_champs.fetch(:date)
-              = try_format_date(c.to_s)
+              = c.to_s
             - when TypeDeChamp.type_champs.fetch(:datetime)
-              = try_format_datetime(c.to_s)
+              = c.to_s
             - else
               = sanitize(c.to_s)
 

spec/models/concern/tags_substitution_concern_spec.rb

@@ -238,7 +238,7 @@ describe TagsSubstitutionConcern, type: :model do
               .update(value: '2017-09-13 09:00')
           end
 
-          it { is_expected.to eq('15/04/2017 2017-09-13 09:00') }
+          it { is_expected.to eq('15 avril 2017 13 septembre 2017 09:00') }
         end
       end
     end