Hi~!
I didn’t fancied that meeting the Japanese!
I’m thinking about it is possible by using Gettext supported by Phoenix to translate the web site.
However, I don’t have experience Phoenix framework… 
That’s why I’m not able to convert its idea into action at any second.
On a different note, I translate the official web site of Elixir-lang into Japanese with two, three developers.
Elixir-lang.jp on GitHub
Can you help our to translate if you are interested it?
Hi~!
It’s very awesome!
As I said above people:
I’d learn to use Phoenix framework.
The English I write is awkward, but I’m glad you said so 
I don’t recommend this. I would use database instead, so you would be able to have translations for every article per publish date and not everything statically. You also would have a problem with introducing notifications for developers and then they would need to contribute instead of nice translations web editor. I believe that it would be hard to maintain in such way.
Also I’m planning to work on my own version of ex_doc which would support translations and compiling documentation into scenic GUI app if you would be interested. However I would need to have some funds for that, because I would need to delay my other project from which I’m expecting to earn some money.
OMG!
That explains why you said that above.
I seem to have to somehow learn even more 
Thank you for your detailed explanation 
うわ〜すごい！お疲れ様。
The translated site looks great.
I’m sure it will be helpful for other Japanese developers who want to learn Elixir.