{
    en: {
      name: "english name",
      content: "english content"
    },
   it: {
      name: "italian name",
      content: "italian content"
    },
   //since images are the same for both, are not nested
   images: {
       mainImage: "dataURL",
       mainThumb: "dataURL"
   }
}

Meteor.publish("elementsCurrentLang", function(currentLang) {

    var projection = {
        images: 1
    };

    projection[currentLang] = 1;

    return Elements.find({}, projection);
});

Router.route('/eng/elements', {
    waitOn: function() {
        return Meteor.subscribe("municipalitiesCurrentLang", Session.get('currentLang'));
    },
    action: function() {
        this.layout('ApplicationLayout');
        this.render('elements');
    }
});

Template.elements.helpers({
    elements: function() {
        var elements = Elements.find();
        var currentLang = Session.get('currentLang');
        var resultList = [];

        elements.forEach(function(element, index) {
            var element = {
                name: element[currentLang].name,
                content: element[currentLang].nameUrl,
                images: element.images
            };

            resultList.push(element);
        });

        return resultList;
    }
});

<h1>{{name}}</h1>
 <p>{{content}}</p>

en.i18n.json:
{
    "hello": "hello"
}
fr.i18n.json:
{
    "hello": "bonjour"
}

{{_ "hello" }}

TAPi18n.setLanguage(getUserLanguage())
//getUserLanguage() <- my function to get the current langage in the user profile or
the one used by the navigator