Actualizacion del codigo PDF Invoices para los pdf de los ecommerce a su ultima version 5.5.0

Actualizacion del codigo PDF Invoices para los pdf de los ecommerce a su ultima version 5.5.0. Se realizo la actualizacion del codigo para las siguientes mejoras: New: Add reference to Peppol extension in readme New: Added configurable custom field to checkout New: Peppol Checkout Field improvements Tweak: Normalize Shop VAT and CoC settings to avoid invalid formatted values Fix: UBL Tax total rounding issues Fix: UBL tax grouping and monetary totals consistency Fix: XML preview overflowing horizontally when PDF is embedded Fix: Hide XML bulk actions when E-Documents feature is disabled Fix: Hide XML preview button for unsupported document types Fix: Prevent extra output in individual XML invoice downloads Fix: Item price allowance rounding in UBL and CII Fix: Backend saving of Peppol Endpoint ID for guest orders Traducciones: Actualizada la plantilla de traducción (POT)