Profile-bound resources stay the same. Settings in existing user profile will not be tampered. In the future, there will be locale-switcher UI in the Preferences dialog. It probably will be similar to Theme switcher. Q to momoi.
Country jp no move needed but value is localizable.
Q to momoi. The following values should not change from language to language. But each locale needs to ship with the same set. DefaultLanguage Legacy items from 4.x. Currently not used in NS6.