Currently, the only way to change the language is to fork the project and update the templates yourself, see: ex_doc/lib/ex_doc/formatter/html/templates at main · elixir-lang/ex_doc · GitHub

If you’d like to work on making this configurable, we could definitely discuss it, open up a new issue or comment on Add support for gettext · Issue #466 · elixir-lang/ex_doc · GitHub.

The :language option is just a hint for the generated epub file.

There is the :language option available to it, perhaps it does already what you want?

:language - Identify the primary language of the documents, its value must be a valid BCP 47language tag; default: “en”

Yes, of course!. I believe it would be desirable to add support for gettext in ExDoc.
I would separate by locale:

• Package: ex_doc (main).
• Package (optional): ex_doc_locale_es_ES (spanish - spain).
• Package (optional): ex_doc_locale_gl_ES (galician - spain).
• Package (optional): ex_doc_locale_pt_PT (portuguese - portugal)
  …

Doc sidebar: Add “locale selector”.

locale_selector398×574 60.3 KB

Thanks a lot for your assistance!