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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.
Other text
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.
Console
By default Windows may not correctly display UTF-8 characters in the OSGi console.
To fix this you need to change the default font for the Command Prompt to a true type font (for example Consolas or Lucinda Console) and then execute chcp 65001
This should be done before running startup.cmd, from the same command prompt window where you just entered the chcp command.
Alternatively you could edit the startup.cmd file to include the chcp 65001 command and set the command prompt as the default.