Locale is the language of the checkout and we support a limited set of locales per country, as we want to ensure that all localized descriptions are keeping a high standard. The locale only affects the language and will never interfere with the purchase country and currency configuration.
For more general information about language localisation see link.
English - Austria
English - Germany
English - Finland
English - Great Britain
English - Netherlands
English - Norway
English - Sweden
English - United States
Swedish - Finland
Above table is all supported languages, we still support other locales but they will fallback to the supported locale. For example
fr-GB would fallback on french translations. If a locale is sent in which is not in our support list at all for example
zh-CN we will fallback to English.
Locale is set on the create order or update order call using the locale property.