"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)."
