Request handler for changing the language of the landing page having anonymous user.

Hi Team, In our app we have a landing paging with user-role anonymous. We would like to change the language in this page based on the language set to the browser. I have gone through few post on this like , But if using widget it is overriding few files and don't want to happen. The other one is we need to write request handler for this. Modeler version which we are using is 7.16. Can anyone help me how to achieve this using a request handler as I am not pretty much good? Thanks in advance   Edit1: Getting this when trying to download and import          
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