private function add_navigation(Template $view)
 {
     $form = new HTMLForm('preambleForm', UpdateUrlBuilder::server_configuration()->rel(), false);
     $action_fieldset = new FormFieldsetSubmit('actions');
     $next = new FormButtonSubmitCssImg($this->lang['step.next'], 'fa fa-arrow-right', 'introduction');
     $action_fieldset->add_element($next);
     $form->add_fieldset($action_fieldset);
     $view->put_all(array('C_PUT_UNDER_MAINTENANCE' => !MaintenanceConfig::load()->is_under_maintenance(), 'SERVER_FORM' => $form->display()));
 }
 private function add_navigation(Template $view)
 {
     $form = new HTMLForm('continueForm', '#error', false);
     $action_fieldset = new FormFieldsetSubmit('actions');
     $back = new FormButtonLinkCssImg($this->lang['step.previous'], UpdateServices::database_config_file_checked() ? UpdateUrlBuilder::server_configuration() : UpdateUrlBuilder::database(), 'fa fa-arrow-left');
     $action_fieldset->add_element($back);
     $this->submit = new FormButtonSubmitCssImg($this->lang['step.next'], 'fa fa-arrow-right', 'finish');
     $action_fieldset->add_element($this->submit);
     $form->add_fieldset($action_fieldset);
     $view->put('SERVER_FORM', $form->display());
 }
 private function build_form()
 {
     $this->form = new HTMLForm('continueForm', '', false);
     $action_fieldset = new FormFieldsetSubmit('actions');
     $back = new FormButtonLinkCssImg($this->lang['step.previous'], UpdateUrlBuilder::introduction(), 'fa fa-arrow-left');
     $action_fieldset->add_element($back);
     $refresh = new FormButtonLinkCssImg($this->lang['folders.chmod.refresh'], UpdateUrlBuilder::server_configuration()->rel(), 'fa fa-refresh');
     $action_fieldset->add_element($refresh);
     $this->submit = new FormButtonSubmitCssImg($this->lang['step.next'], 'fa fa-arrow-right', 'server');
     $action_fieldset->add_element($this->submit);
     $this->form->add_fieldset($action_fieldset);
 }