pert:
I see you have opened an issue in the arduino/reference-en repository:
I want to make Korean translation of arduino reference · Issue #227 · arduino/reference-en · GitHub
so that's the first step.From here the next steps are:
- Wait to see how the Arduino web team will respond to your proposal. If they accept it then they will create a new repository on GitHub: arduino/reference-kr. This repository will initially contain a copy of arduino/reference-en, meaning all the pages will be in English.
- Fork arduino/reference-kr. This will give you your own copy of the repository to edit (sebuls/reference-kr).
Thanks. Step 1 was done.
arduino/reference-ko is created.
Now all contents of that is English.
How can I fork it ?
I found Fork button! It is on the upper right corner.
Thank you very much ! 
Step2 is done.