code: public Map<String, String> getAll(RouteContext routeContext) {
          String language = languages.getLanguageOrDefault(routeContext);
          return getAll(language);
      }
docs: Returns all localized messages.
  <p>
  The current Request and Response are used to help determine the messages
  resource to use.
  <ol>
  <li>Exact locale match, return the registered locale messages
  <li>Language match but not a locale match, return the registered language
  messages
  <li>Return the default messages
  </ol>
  </p>
  
  @param routeContext
  @return all localized messages