Constantly updated lists of world countries and their associated alpha-2, alpha-3 and numeric country codes as defined by the ISO 3166 standard, available in CSV, JSON , PHP, SQL and XML formats, in multiple languages and with national flags included; also available are the ISO 3166-2 codes of provinces/ states associated with the countries
This effectively reverts commit https://github.com/stefangabos/world_countries/commit/f6ff6d0d21686791072901992875c0745158d875. According to https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
et
is the correct language code for Estonian. Apologies if there was another reason for the previous change, but if so the documentation should probably be updated.