Synchronize product data across translated nodes

verbatim from http://www.firewing1.com/node/27

As I mentioned in the introduction, this is due to the fact that each translation is in fact a node to itself. Since Drupal assigns each node with content type "product" the standard Ubercart attribute set, each product node must be updated individually. Fortunately, there is a quick and easy was to solve this by creating a custom module:

1. Enable the i18nsync ("Synchronize Translations") module in Administer > Site building > Modules
2. Create a custom module which will hook into i18nsync:
1. Create the folder sites/all/modules/custommod
2. Paste the following into sites/all/modules/custommod/custommod.info:

name = Custom module
description = A custom module which helps with the translation of an Ubercart store
core = 6.x

3. Paste into sites/all/modules/custommod/custommod.module:

<?php
/**
  * Implementation of hook_i18nsync_fields_alter().
  */
function custommod_i18nsync_fields_alter($fields, $type) {
  if(in_array($type, uc_product_types())) {
    $fields['uc_products']['#title'] = 'Products';
    // These values were found by doing a print_r($node) in node-product.tpl.php
    $fields['uc_products']['#options'] = array (
      'model' => 'SKU',
      'list_price' => 'List Price',
      'cost' => 'Cost',
      'sell_price' => 'Sell Price',
      'weight' => 'Weight',
      'weight_units' => 'Weight Units',
      'dim_length' => 'Length',
      'dim_width' => 'Width',
      'dim_height' => 'Height',
      'length_units' => 'Length Units',
      'pkg_qty' => 'Quantity',
      'default_qty' => 'Default quantity to add to cart'
    );
  }
}
?>

3. Go to Administer > Site building > Modules and enable "Custom module"
4. Go to Administer > Content management > Content types and edit the "Product" content type
1. Under Workflow Settings > Synchronize translations, select all fields you would like to synchronize. However, do not select the Taxonomy terms option (see below for why)
2. Repeat this step for any other product classes/content types whose product data you want synchronized

That's all! If you edit a node in one language, you should see the updated product data in all other languages as well. The only caveat is that product attributes and product options will still need to be added and updated on each translation.

Note: As mentioned in the caveat at the bottom of the quote, this doesn't fix the lack of synchronization for product attributes and product options.