Use method from Globalizable module

Since we have a method defined inside the Globalizable
module we don't need to create the same method in every model

app/models/milestone.rb

@@ -14,7 +14,7 @@ class Milestone < ActiveRecord::Base
   validates :milestoneable, presence: true
   validates :publication_date, presence: true
 
-  before_validation :assign_milestone_to_translations
+  before_validation :assign_model_to_translations
   validates_translation :description, presence: true, unless: -> { status_id.present? }
 
   scope :order_by_publication_date, -> { order(publication_date: :asc, created_at: :asc) }
@@ -25,9 +25,4 @@ class Milestone < ActiveRecord::Base
     80
   end
 
-  private
-
-    def assign_milestone_to_translations
-      translations.each { |translation| translation.globalized_model = self }
-    end
 end

app/models/progress_bar.rb

@@ -17,12 +17,7 @@ class ProgressBar < ActiveRecord::Base
             }
   validates :percentage, presence: true, inclusion: RANGE, numericality: { only_integer: true }
 
-  before_validation :assign_progress_bar_to_translations
+  before_validation :assign_model_to_translations
   validates_translation :title, presence: true, unless: :primary?
 
-  private
-
-    def assign_progress_bar_to_translations
-      translations.each { |translation| translation.globalized_model = self }
-    end
 end