Grails i18N on google App Engine

Have this in BootStrap.groovy

import grails.util.Environment;
class BootStrap {
    def messageSource
    def init = { servletContext ->
        if( Environment.getCurrent() == Environment.PRODUCTION ){
            messageSource.basenames = [ 'WEB-INF/grails-app/i18n/messages' ]
            messageSource.clearCache()    
        }
    }
    def destroy = {
    }
} 

Run these two commands to package and deploy

1. grails -Dgrails.env=production app-engine package
   
2. appcfg.sh update ./target/war