Setting Language in Mac OS X Recovery Mode.
To enter Recovery mode in Mac OS X by pressing and hold Command + R just after turning on the computer.
If you find the language is not yours and you don't understand, how to change the language ?.
1. Go to the third tab from left side.
2. Choose first row.
3. Choose your language. (for example I choose English)
4. Now the language is in English.
See also : Change language in Mac OS X