Well, having read the reviews, documentation, and installed this thing, I have been quite disappointed. Result - uninstalled. The way the documentation is distributed and structured makes it impossible to discover how to add languages to the default install. Searching the forums results in error messages suggesting the search terms are not adequate.Conclusion - I have been found inadequate by this developer - with no obvious way to resolve.
Not for the faint hearted, or anyone who can't spend more that 48 hours troubleshooting.
Not for me - Sorry.