Add status to translations

app/models/problem.rb

@@ -11,6 +11,14 @@ class Problem < ApplicationRecord
     !!self.translation
   end
 
+  def set_translation(translation)
+    if self.is_translated?
+      self.translation.outdated!
+    end
+    self.translation = translation
+    self.translation.in_use!
+  end
+
   def original_url
     "https://projecteuler.net/problem=#{self.id}"
   end

app/models/translation.rb

@@ -1,5 +1,6 @@
 class Translation < ApplicationRecord
   belongs_to :problem, inverse_of: :translations
+  enum status: [:pending, :in_use, :outdated, :declined]
 
   validates :title, :content, :problem_id, presence: true
   validate :title_is_unique_among_other_problems