[suggestion] Will not echo support Japanese Document?

[n9te9]

Issue Description

Echo support English Document like below URL.
https://echo.labstack.com/

Will not echo support Japanese like above Document?
I often saw most of developer in Japan can't good use echo. (e.g. binder interface)

If echo would like to support Japanese, I'll help it.

Checklist

• Dependencies installed
• No typos
• Searched existing issues and docs