Create LocalCensusRecords index page

* Create admin controller and routes
* Add pagination
* Add search by document_number
* Add EN and ES translations
* Add index specs
* Add missing model specs

config/routes/admin.rb

@@ -255,4 +255,6 @@ namespace :admin do
   put 'download_settings/:resource', to: 'download_settings#update', as: 'update_download_settings'
 
   get "/change_log/:id", to: "budget_investments#show_investment_log", as: "change_log"
+
+  resources :local_census_records
 end