title: Product ID shown in product page
body: <p>I'd like to use Product ID instead of Reference Code on product page. </p>
  
  <p>I want to show it like this : <strong>Product ID :</strong> <strong><em>Product ID itself</em></strong> </p>
  
  <p>Example : Product ID of the item in backofice is 47. So that on the product page of this product is shown - <strong>ID :</strong> <strong><em>47</em></strong>   instead of <strong><em>Reference Code : dj-fr586</em></strong></p>