@Transformer(requireTemplate = true)
    public static String i18n(Object key, Object... args) {
        return i18n(null, key, args);
    }
@ Transformer ( requireTemplate = true ) public static String i18n ( Object key , Object ... args ) { return i18n ( null , key , args ) ; }
Transformer method. Return i18n message of a given key and args.

@param key
@param args
@return the i18n message