You can clone with
HTTPS or Subversion.
The tunine API is generally inconsistent across categories but browsing by language is totally wacky. It uses filters rather than a guide_id like everything else.
It might be easier in all cases if the Tunein API wrapper was to extract navigation info from the URL field instead of using prior knowledge about each category's data format. In any case, won't bother supporting "by language" unless it's asked for.