Reading http://docs.elgg.org/wiki/Documentation/Guidelines now, maybe I can find what I was looking for.

That's great news! Thanks for getting involved. It will be great to have more translations and docs available and agree on your approach to contributing to the official docs rather than maintaining your own, as you say.

The wiki is deprecated and we are moving everything to learn.elgg.org. To add new docs, you should submit a PR on github against the 1.9 branch. Also, read up about our documentation style, organization, and standards.

If you just want to focus on contributing translations, that of course appreciated as well. But in order to do this for the docs, you should chime in on the relevant github ticket and make your case. The rest of the core team unfortunately has not been interested in translating the docs historically, but I believe they are open to being persuaded.

I see, many thanks!

I will look into the Github ticket (I was already having a look at http://sphinx-doc.org/latest/intl.html).