configure i18n

app/controllers/application_controller.rb

@@ -3,6 +3,11 @@ require 'digest/sha1'
 
 class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception
+  before_action :set_locale
+
+  def set_locale
+    I18n.locale = http_accept_language.language_region_compatible_from(I18n.available_locales)
+  end
 
   def current_user
     @current_user ||= User.find_by(id: session[:user_id])