Bing web master tools

I am building a website http://ift.tt/2CXH0tJ and which I linked to bing webmaster tools. But it is showing an error that

language meta tags are missing it is suggesting me to put some code on the head tag. the code is

<meta http-equiv="content-language" content="ll-cc">

it is saying that i have to replace

ll-cc with my codes but do not know what I have to put there. pls help