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Developers who want to support community efforts to translate their plugins should include a complete base resource bundle in their project. To recap: this is a file called /packages/resources/admin.properties in your plugin. This isn't necessary if the code is not going to be released or if you're happy for other developers to complete this next step. By default FarCry handles the lack of a resource bundle invisibly by returning the default values provided in code.
The Resource Bundle Plugin provides functionality for automatically generating bundles based on default values, base bundles, or even with the Google Translate API. But it is important to remember that the automatic generation of the base bundle only handles resources that have been "touched". This means that a button label (for example) will only be known to the plugin if you have actually accessed the form.