Show Product ID customer choosen in Backend

Abstract:
- the Backend >> Orders: shows the proudtcs_name, but not the customer-choosen products_model (number).
- added an additional query to get the products_model from the TABLE_PRODUCTS, and display it.
- actually this should be implemented in the way, that the products_model is saved in the orders-table, to avoid issues with the products-table being updated and then displaying wrong order-information later on.

Changes:
==========================
/admin/includes/languages/english/orders.php
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add: l 28:
define('TABLE_HEADING_PRODUCTS_ARTNR', 'nr.');


/admin/includes/languages/german/orders.php
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add: l 28:
define('TABLE_HEADING_PRODUCTS_ARTNR', 'Nr.');


/admin/orders.php
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172 add
   
197 add
// email added for displaying the customer choosen products_model = eg. T5863 in addition to the products name
// query DB within the ALL_products_of_this_order_loop
$model = tep_db_query("select products_model from " . TABLE_PRODUCTS . " where products_id= '" . $products_values['products_id'] . "'");
$model_values = tep_db_fetch_array($model); // echo $model_values['products_model'];

204 add
// email added for displaying the customer choosen products_model = eg. T5863 in addition to the products name
// display it
echo '  ' . $model_values['products_model'] . ' ' . "n";


178 change to colspan 5
 
249 change to colspan 5
 
252 change to colspan 5