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var navigatorLang = navigator.language || navigator.userLanguage;

var userCulture = '';
if( navigatorLang.indexOf("es") >= 0 ) {
    userCulture = 'ES';
} else if ( navigatorLang.indexOf("pt") >= 0 ) {    
    userCulture = 'PT';
} else {
    userCulture = 'EN';
}

$(document).ready(function(){
    console.log(userCulture);
});