Change site display language according to the user

Question

How to change the site displaying language according to the user ? There is a drop-down to select language in a web page according to that whole site display language change and also user's language in user profile need to change. How to do that in using server side programmatically.

Answer 1

using variation features. The SharePoint will translate based on your browser language setting.

More info: About SharePoint 2013 display language

Answer 2

If you are using 2010 use following function:

function ChangeLanguage()
{
//script fetches current display language
var lcid =_spPageContextInfo.currentLanguage;
//1025 language code for arabic
if(lcid.toString()!=1025)
{
var today = new Date();
var oneYear = new Date(today.getTime() + 365 * 24 * 60 * 60 * 1000);
var url = window.location.href;
//script changes current display language to arabic i.e 1025
document.cookie = "lcid=" + 1025 + ";path=/;expires=" + oneYear.toGMTString();
window.location.href = url;
}
}

I don't think the server side equivalent is available for this as all the properties of SPRegionalSettings are Get only, no option for set.