Even though HelpNDoc can handle projects in any language, it doesn't support translation of projects content yet. See: How to localize your documentation output.
This is something that we plan to implement in a future update, but we can't say when that will be available. Meanwhile, here are a few work-around:
- Rely on a third-party translation tool to directly translate the output generated by HelpNDoc: most documentation formats such as HTML, CHM and Word documents can be translated by translation tools such as Trados or Sisulizer;
- Create one HelpNDoc project per language.