This wiki is primarily written in english.
On top of every page, a box indicates the different versions of that page. Blue boxes are for the existing translations, grey boxes are the pending translations.
Geckos development & documentation redaction are time-consuming. Also, as I am knee-deep in the engine, it could occur that the documentation miss an important element. Or is not up-to-date with a major development.
You could help with that ! First, you could write an Issue to let me know that some piece is missing. Or you could comment on an existing demand for documentation of an aspect. That's a good way to let me know what is important and needed.
You could also write for this wiki. In this case, contact me on github, my blog or any board I participate in. I'll then grant you access to edit the wiki.