The LOCALIZED_MESSAGE domain allows entries in a server message catalog to be displayed on a client screen. The domain is string based but expects the string to be formatted in specific way. The Cúram Server Development Environment (SDEJ) provides support for formatting a message catalog entry in this way so it can be returned to the client. See the Cúram Server Developers Guide for full details on working with message catalogs.
Once the message catalog entry has been formatted on the server side it should be assigned to a field which is based on the LOCALIZED_MESSAGE domain and returned to the client. The message entry will be displayed according to the current locale and values will be assigned to the message placeholders.