Did anyone have success rendering a course in a language other than English?

From my experience, even if config.json declares "pt" as _defaultLanguage (and has couse contents under 'src/course/pt'), the framework still wants to render the English content, resulting in 404s if no English content exists (the 'src/course/en' subdir).

If this is supposed to be working, any clues on what I may be doing wrong?