Update milestones translatable fields

Note the title field was hidden since commit 01b9aa8, even though it was
required and translatable. I've removed the required validation rule,
since it doesn't seem to make much sense and made the translatable
tests harder to write.

Also note the method `I18n.localize`, which is used to set the
milestone's title, uses `I18n.locale` even if it's inside a
`Globalize.with_locale` block, and so the same format is generated for
every locale.

app/controllers/admin/budget_investment_milestones_controller.rb

@@ -46,8 +46,8 @@ class Admin::BudgetInvestmentMilestonesController < Admin::BaseController
   def milestone_params
     image_attributes = [:id, :title, :attachment, :cached_attachment, :user_id, :_destroy]
     documents_attributes = [:id, :title, :attachment, :cached_attachment, :user_id, :_destroy]
-    attributes = [:title, :description, :publication_date, :budget_investment_id, :status_id,
-                  *translation_params(Budget::Investment::Milestone),
+    attributes = [:publication_date, :budget_investment_id, :status_id,
+                  translation_params(Budget::Investment::Milestone),
                   image_attributes: image_attributes, documents_attributes: documents_attributes]
 
     params.require(:budget_investment_milestone).permit(*attributes)

app/models/budget/investment/milestone.rb

@@ -9,11 +9,11 @@ class Budget
 
       translates :title, :description, touch: true
       globalize_accessors
+      accepts_nested_attributes_for :translations, allow_destroy: true
 
       belongs_to :investment
       belongs_to :status, class_name: 'Budget::Investment::Status'
 
-      validates :title, presence: true
       validates :investment, presence: true
       validates :publication_date, presence: true
       validate :description_or_status_present?

app/views/admin/budget_investment_milestones/_form.html.erb

@@ -2,9 +2,6 @@
 
 <%= translatable_form_for [:admin, @investment.budget, @investment, @milestone] do |f| %>
 
-  <%= f.hidden_field :title, value: l(Time.current, format: :datetime),
-                             maxlength: Budget::Investment::Milestone.title_max_length %>
-
   <div class="small-12 medium-6 margin-bottom">
     <%= f.select :status_id,
           @statuses.collect { |s| [s.name, s.id] },
@@ -14,9 +11,14 @@
                 admin_budget_investment_statuses_path %>
   </div>
 
-  <%= f.translatable_text_area :description,
+  <%= f.translatable_fields do |translations_form| %>
+    <%= translations_form.hidden_field :title, value: l(Time.current, format: :datetime),
+                               maxlength: Budget::Investment::Milestone.title_max_length %>
+
+    <%= translations_form.text_area :description,
                                     rows: 5,
                                     label: t("admin.milestones.new.description") %>
+  <% end %>
 
   <%= f.label :publication_date, t("admin.milestones.new.date") %>
   <%= f.text_field :publication_date,

spec/features/admin/budget_investment_milestones_spec.rb

@@ -47,7 +47,7 @@ feature 'Admin budget investment milestones' do
       click_link 'Create new milestone'
 
       select status.name, from: 'budget_investment_milestone_status_id'
-      fill_in 'budget_investment_milestone_description_en', with: 'New description milestone'
+      fill_in 'Description', with: 'New description milestone'
       fill_in 'budget_investment_milestone_publication_date', with: Date.current
 
       click_button 'Create milestone'
@@ -69,7 +69,7 @@ feature 'Admin budget investment milestones' do
 
       click_link 'Create new milestone'
 
-      fill_in 'budget_investment_milestone_description_en', with: 'New description milestone'
+      fill_in 'Description', with: 'New description milestone'
 
       click_button 'Create milestone'
 
@@ -93,7 +93,7 @@ feature 'Admin budget investment milestones' do
 
       expect(page).to have_css("img[alt='#{milestone.image.title}']")
 
-      fill_in 'budget_investment_milestone_description_en', with: 'Changed description'
+      fill_in 'Description', with: 'Changed description'
       fill_in 'budget_investment_milestone_publication_date', with: Date.current
       fill_in 'budget_investment_milestone_documents_attributes_0_title', with: 'New document title'
 

spec/models/budget/investment/milestone_spec.rb

@@ -9,9 +9,9 @@ describe Budget::Investment::Milestone do
       expect(milestone).to be_valid
     end
 
-    it "is not valid without a title" do
+    it "is valid without a title" do
       milestone.title = nil
-      expect(milestone).not_to be_valid
+      expect(milestone).to be_valid
     end
 
     it "is not valid without a description if status is empty" do