Add locale to the available locales

The below table describes the response parameters:

Parameter	Type	Description	Example
availableLocales	array
availableLocales[index]	array
availableLocales[index].code	string	Locale in the following format: {language-ISO639}-{countryCode-ISO3166} lowercase.	en-us
availableLocales[index].hidden	boolean		false
availableLocales[index].translationFallbackTypes	array	Valid array values: DEFAULT_LOCALE,SYSTEM_LOCALE. Allow to control the fallback mechanism. If not provided(null) then the default behavior is the following fallback order: -> DEFAULT_LOCALE -> SYSTEM_LOCALE. The recommended value is null. When all of the fallback types return an empty value, no translation will be made, i.e. the original value will be retained
defaultLocaleCode	string	Locale in the following format: {language-ISO639}-{countryCode-ISO3166} lowercase.	en-us
systemLocaleCode	string

400Code : LOCALE_ALREADY_EXIST, Details: []