"The last possibility is to not specify the locale, which
results in using the default locale of the browser, which Dojo
extracts from the navigator object. The default behavior, like any
usage of default for that matter, is useful in cases where you can
predict how your client’s browser and machine are configured.
This is rarely the case, and installing the browser in a language
which is not the user’s mother tongue, or a locale with which
your application is not familiar, is not uncommon (so do try to
avoid using this approach)."