Extension service developers can provide localized content for service-specific tasks and events by creating and uploading a localization bundle.

An extension service localization bundle is a file in zip format that contains one or more properties files. Each file in the bundle has a name that indicates the locale to which it applies, and contains an arbitrary number of key=value pairs, where the key is the value of an attribute of a service-specific task operation or event, and the value is a localized string to display in log messages posted by the service.