i was using the macbook TextEdit. I went to godaddy pannel and managed to change the language from there, and poof, it went up again no error.
Thank you for your consideration and for your quick answer!
Hello, I have the same problem, my site is down after editing the wp-config file and changing the language from en_US to es by mistake, and now I changed it back but still get 500 internal error, please help!