ESTO EN IMAGES.PHP
$title = $lang['field_description_ext'].((isset($file_src)) ? get_iptc_insert_link($file_src, "caption", "image_description") : "");
show_textarea_row($title, "image_description", $image_row['image_description'], $textarea_size);
$title = $lang['field_keywords_ext'].((isset($file_src)) ? get_iptc_insert_link($file_src, "keyword", "image_keywords") : "");
show_textarea_row($title, "image_keywords", $image_row['image_keywords'], $textarea_size);
show_cat_select_row($lang['field_category'], $image_row['cat_id'], 3);
show_user_select_row($lang['user'], $image_row['user_id']);
$title = $lang['field_date'].$lang['date_desc'].$lang['date_format'].((isset($file_src)) ? get_iptc_insert_link ($file_src, "date_created", "image_date", 0) : "");
show_input_row($title, "image_date", $image_row['image_date'], $textinput_size);
show_radio_row($lang['field_allow_comments'], "image_allow_comments", $image_row['image_allow_comments']);
show_additional_fields("image", $image_row, IMAGES_TABLE);
show_form_footer($lang['save_changes'], $lang['reset'], 2, "", " onClick='showProgress()'");

$additional_image_fields['descripcion2'] = array($lang['descripcion2'], "textarea", 1);
}
if ($action == "saveimages") {
$date = time();
$ip = getenv("REMOTE_ADDR");
$error_msg = "";
$num_newimages = $HTTP_POST_VARS['num_newimages'];
ESTO EN DETAILS.PHP
}
}
else {
$prev_image_name = REPLACE_EMPTY;
$prev_image_url = REPLACE_EMPTY;
$prev_image_file = REPLACE_EMPTY;
$prev_thumb_file = REPLACE_EMPTY;
}
$site_template->register_vars(array(
"next_image_id" => $next_image_id,
"next_image_name" => $next_image_name,
"next_image_url" => $next_image_url,
"next_image_file" => $next_image_file,
"next_thumb_file" => $next_thumb_file,
"prev_image_id" => $prev_image_id,
"prev_image_name" => $prev_image_name,
"prev_image_url" => $prev_image_url,
"prev_image_file" => $prev_image_file,
"prev_thumb_file" => $prev_thumb_file
));
unset($next_prev_cache);

$additional_image_fields['descripcion2'] = array($lang['descripcion2'], "textarea", 1);
//-----------------------------------------------------
//--- Save Comment ------------------------------------
//-----------------------------------------------------
$error = 0;
if ($action == "postcomment" && isset($HTTP_POST_VARS[URL_ID])) {
$id = intval($HTTP_POST_VARS[URL_ID]);
$sql = "SELECT cat_id, image_allow_comments
FROM ".IMAGES_TABLE."
WHERE image_id = $id";
$row = $site_db->query_firstrow($sql);
ESTO EN LANG/SPANISH/MAIN.PHP
$lang['image_file_required'] = "¡Elige un Archivo de Imagen!";
$lang['new_upload_emailsubject'] = "Nuevo envío a {site_name}";
$lang['new_upload_validate_desc'] = "Tu imagen será validada una vez que esto sea revisado.";

$lang['descripcion2] = "Carasteristicas técnicas:";
//-----------------------------------------------------
//--- Caja de Favoritos -------------------------------
//-----------------------------------------------------
$lang['lightbox_no_images'] = "No hay imágenes guardadas en su caja de favoritos.";
Es que no sabia donde ponerlo y la verdad que lo he puesto a boleo..., el campo de la BBDD se llama igual = descripcion2