Property:

org.zkoss.util.label.cache

Default: true

Specifies whether to cache zk-labels.properties. By default, it is enabled. It means the content of zk-labels.properties is loaded and cached at the server. If you are developing a ZK application and you’d like to modify zk-labels.properties without restarting the server, you could disable it.

Please refer to ZK Developer’s Reference: Internationalization for more information about zk-label.properties.