onBeforeChange hook is called regardless of if the new locale
is the same as the current locale. If the hook is asynchronous and
another setLocale is called before it finishes, the locale will not be set
with the current call and will be set with the new call instead.
Set the selected locale
Returns
falseif the locale is not supported.onBeforeChange hook is called regardless of if the new locale is the same as the current locale. If the hook is asynchronous and another
setLocaleis called before it finishes, the locale will not be set with the current call and will be set with the new call instead.