In this case it's not a country code but a language code (ISO 639-1). And Ukrainian language code is in fact UK. So dear author, you can revert your last commit ;-)

https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes

> UK is the ISO code for the country.

Erm, since when ?

ISO3166 quite clearly says: UNITED KINGDOM GB and UKRAINE UA

UK is "exceptionally reserved" on request of the United Kingdom, but it is not the official abbreviation, which is GB.

See the https://www.iso.org/iso-3166-country-codes.html and follow the link to "Online Browsing Platform".

Per ISO 639-1 (language codes) it's UK for Ukrainian language

https://www.loc.gov/standards/iso639-2/php/langcodes_name.ph...

Oupss, sorry ! Thank's