A first approach to handle D7 Commerce 1 products translated using i18n

Closes #3204186

modules/commerce/src/Plugin/migrate/source/commerce1/ProductDisplay.php

@@ -65,6 +65,8 @@ class ProductDisplay extends FieldableEntity {
       'changed' => t('Changes'),
       'field_name' => t('Field name for variations'),
       'variations_field' => t('Value of the product reference field'),
+      'language' => $this->t('Language (fr, en, ...)'),
+      'tnid' => $this->t('The translation set id for this product'),
     ];
   }
 
@@ -94,6 +96,8 @@ class ProductDisplay extends FieldableEntity {
       'status',
       'created',
       'changed',
+      'language',
+      'tnid',
     ]);
     $query->fields('fc', ['field_name']);