Sitecore Language resolver didn’t change much since I am working with Sitecore. I remember John West blog post explaining the order of resolution.

1. The sc_lang query string parameter.
2. The language prefix in the path in the requested URL.
3. The language cookie associated with the context site.
4. The default language associated with the context logical site.
5. The DefaultLanguage setting specified in web.config.

But what if I would like to change it ?

1. The sc_lang query string parameter.
2. The language prefix in the path in the requested URL.
3. The language cookie associated with the context site.
4. The language corresponding to visitor IP – using Geolocation service 
5. The default language associated with the context logical site.
6. The DefaultLanguage setting specified in web.config.

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