panel/config/routes.rb

Rails.application.routes.draw do
  root 'application#index'

  get 'login/new', to: 'login#new'
  post 'login', to: 'login#create'

  resources :sites do
    resources :posts

    get 'i18n', to: 'i18n#index'
    get 'i18n/edit', to: 'i18n#edit'
    post 'i18n', to: 'i18n#update'
  end
end