app/views/export_tasks/_fields_gtfs_export.html.erb
<%= form.input :time_zone, :as => :time_zone, :input_html => { :value => @referential.time_zone ,:title => t("formtastic.titles.export_task.time_zone")} %>
<%= form.input :object_id_prefix, :input_html => { :value => @referential.prefix ,:title => t("formtastic.titles.export_task.object_id_prefix")} %>