Added missing CommercialReturnItemDelete logic and template
Added document_name method to CommodityInCommercialReturn model co aggregate unknown_origin and document in views
Changes to displayed strings, some typo fixes and template optimizations
Added driver_name and car_plates fields to CommercialReturn model, and corresponding qa views and templates
Added driver_name and car_plates fields to S:CommercialReturn form
Fix for no string if unknown origin
Changed LANGUAGE_CODE to correct pl-pl locale