Add about pages

app/controllers/about_controller.rb

@@ -0,0 +1,16 @@
+class AboutController < ApplicationController
+  def index
+  end
+
+  def info
+  end
+
+  def copyright
+  end
+
+  def legal
+  end
+
+  def roman_numerals
+  end
+end

app/controllers/problems_controller.rb

@@ -3,6 +3,7 @@ class ProblemsController < ApplicationController
 
   def index
     @problems = Problem.paginate(page: params[:page]).includes(:translation)
+    @translated_percentage = 100 * Problem.translated_count / Problem.count
   end
 
   def show