Comment by bkcsoft

It is infact using `Accept-Language`-header and `lang`-cookie as seen in this[1] file on line 168, 184 and 196. This is according to W3C[2] a good starting point :)

[1] https://github.com/go-macaron/i18n/blob/ef57533c3b0fc2d8581d... [2] https://www.w3.org/International/questions/qa-accept-lang-lo...