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Finally, it's possible to zip up the contents of the i18n directory and have that used instead of the i18n directory itself.
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By default Weave only performs i18n substitution of % prefixed values that are contained within the client config, so if you need to internationalise other items, for example map layer names, this will not happen by default.
You can enable i18n processing of all responses sent from the server to the client, which includes stuff like the layer names from map engines or toc model entries, you need to set the system property weave.i18n.all to true, by adding -Dweave.i18n.all=true to startup.cmd and/or weave-service.conf.
This way you can setup your underlying map engine (ArcIMS, ArcGIS, etc) to return "%map.layer.property", or for the toc model layer label, for the layer name for a Property layer, and by setting up the appropriate resources for the map.layer.property value the layer will appear in a localised name for the user.