Add flash error for shift creation without date, increase spec

app/controllers/admin/poll/shifts_controller.rb

@@ -14,10 +14,10 @@ class Admin::Poll::ShiftsController < Admin::Poll::BaseController
     @officer = @shift.officer
 
     if @shift.save
-      notice = t("admin.poll_shifts.flash.create")
-      redirect_to new_admin_booth_shift_path(@shift.booth), notice: notice
+      redirect_to new_admin_booth_shift_path(@shift.booth), notice: t("admin.poll_shifts.flash.create")
     else
       load_shifts
+      flash[:error] = t("admin.poll_shifts.flash.date_missing")
       render :new
     end
   end

config/locales/en/admin.yml

@@ -520,6 +520,7 @@ en:
       flash:
         create: "Shift added"
         destroy: "Shift removed"
+        date_missing: "A date must be selected"
       vote_collection: Collect Votes
       recount_scrutiny: Recount & Scrutiny
     poll_booth_assignments:

config/locales/es/admin.yml

@@ -520,6 +520,7 @@ es:
       flash:
         create: "Añadido turno de presidente de mesa"
         destroy: "Eliminado turno de presidente de mesa"
+        date_missing: "Debe seleccionarse una fecha"
       vote_collection: Recoger Votos
       recount_scrutiny: Recuento & Escrutinio
     poll_booth_assignments:

spec/features/admin/poll/shifts_spec.rb

@@ -88,7 +88,7 @@ feature 'Admin shifts' do
     end
   end
 
-  scenario "Erros on create", :js do
+  scenario "Error on create", :js do
     poll = create(:poll)
     booth = create(:poll_booth)
     officer = create(:poll_officer)
@@ -104,7 +104,7 @@ feature 'Admin shifts' do
     click_link "Edit shifts"
     click_button "Add shift"
 
-    expect(page).to have_content "can't be blank"
+    expect(page).to have_content "A date must be selected"
   end
 
   scenario "Destroy" do