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

app/controllers/admin/local_census_records_controller.rb

@@ -0,0 +1,8 @@
+class Admin::LocalCensusRecordsController < Admin::BaseController
+  load_and_authorize_resource
+
+  def index
+    @local_census_records = @local_census_records.search(params[:search])
+    @local_census_records = @local_census_records.page(params[:page])
+  end
+end