Currently there is one 'English' as a language option, this is in reality American or American English. Some of the differences are not at al subtle. Virtually all other services have the two separated, as American is a fairly isolated language whereas English (or British English) covers the UK, Australia, New Zealand, large numbers in India and a majority in Europe (though American is also popular in Europe now).

It seems like minimal effort would be required to create a proper English as an additional language but would remove so much confusion with English speakers that don't understand many of the American terms.