Returns the locale used for translations and formats for this calendar system instance. This allows a calendar system instance to be independent of the global translations and formats if required. All implementations must refer to this locale. Only for internal calendar system use; if public access is required then provide public methods only for those methods actually required. Any app that creates an instance with its own locale overriding global will have the original handle to the locale and can manipulate it that way if required, e.g. to change default date format. Only expose those methods that library widgets require access to internally.
