node.module, line 1321:
$form['texts']['#title'] = t('Properties');
(was 'text')
content.module, line 120:
return confirm_form('_content_admin_type_delete', $form, t('Are you sure you want to delete the content type %type?', array('%type' => theme('placeholder', $type->label))), 'admin/settings/content-types', t('If you have any content left in this content type, it will be permanently deleted. This action cannot be undone.'), t('Delete'), t('Cancel'));
(note the change in path to 'admin/settings/content-types')