Transform messages in JSON that can be parsed in javascript

I18NService.groovy

package com.wordpress.sergiosmind.lang

import grails.converters.JSON
import org.springframework.context.support.ReloadableResourceBundleMessageSource.PropertiesHolder

class I18NService {
  /** Dependency Injection for ExposedKeysMessageSource */
  def messageSource
  /**
   * Get's all messages for the Locale and  encode to a JSON String.
   */
  String messagesToJavaScript(Locale locale) {
    
    def messages = [:]
  	
    List<PropertiesHolder> holders = messageSource.getAllProperties(locale)
		
    for(PropertiesHolder holder : holders) {
      Properties props = holder.getProperties()
      Set keys = props.keySet()
      for(String key : keys) {
        messages[key] = props.get(key)
      }
    }
		
    return ((messages as JSON).encodeAsJavaScript())
    
  }
  
}