What is the best way to organize multilingualism in express?

Question

Node.js

What is available:
- a middleware in express, which determines the language on each request and writes it to the req._lang variable, after which req is passed further down the chain
- the Translate class with the #setLocale(lang) method (sets the default translation language to lang) and #_(lang, phrase, args) method (translates phrase string with args arguments into lang language (if null - default))
- templating engine
Obvious option

var t = new Translate({..});
var app = express();

app.get('/url', function(req, res){
    var nick, name;
    ...
    t.setLocale(req._lang);
    res.render('template.html', {
        title: t._('Hello, %s', nick),
        description: t._('This is a long description, my dear %s, ...', name)
    });
});

// template.html
<h1><%= title %></h1>
<div><%= description %></div>

looks extremely unkosher, I want to have something like

app.get('/url', function(req, res){
    var nick, name;
    ...
    res.render('template.html', {
        nick: nick,
        name: name
    });
});

// template.html
<h1><% _('Hello, %s', nick) %></h1>
<div><% _('This is a long description, my dear %s, ...', name) %></div>

those. we give the template only raw data, and it chooses the translation and formats it.
an example of how I imagine it

var t = new Translate({..});
var app = express();

// мидлвар
app.use(function(req, res, next){
     req._ = function(phrase, args){
          return t._(req._lang, phrase, args);
     }
});

those. we have the req#_() method, a complete analog of the native #_(), except that it automatically substitutes the language and does not change the global scope of the t object (via #setLocale()),
only how to use it inside the template when rendering now? how do you actually implement this? Are there better implementations?
thank.

Answer 1

Look at Sails , they have just such a contraption implemented.