Support localization of internal data

(+) (PK) i18n.name
(+) (PK) i18n.locale
(+)      i18n.value

public interface I18nService \{

    /* Get value for current locale */
    public String lookup(String name);

    /* Get value for any locale */
    public String lookup(String name, Locale locale);

    /* Add a value */
    public void add(String name, Locale locale, String value);
\}