Country codes

It would be useful to use the 2 letter ISO country codes instead of the names of countries, ie ES, UK, AU, NL, etc. It’s not a major issue, but it does create an inconsistency when printing invoices. At the moment, the patient address on the invoice is in the country’s official language, all except for the actual name of the country which is in English. Using the ISO codes would solve this issue and wouldn’t require translation.