Fix i18n used in multilingual book

Author: SamyPesse

lib/generators/website.js

@@ -100,7 +100,6 @@ Generator.prototype.prepareTemplateEngine = function() {
         that.env.addFilter('lvl', function(lvl) {
             return lvl.split(".").length;
         });
-        that.env.addGlobal('__', that.book.i18n.bind(that.book));
 
         // Add extension
         that.env.addExtension('AutoEscapeExtension', new AutoEscapeExtension(that.env));
@@ -238,6 +237,8 @@ Generator.prototype._writeTemplate = function(tpl, options, output, interpolate)
 
                 basePath: ".",
                 staticBase: path.join(".", "gitbook"),
+
+                '__': that.book.i18n.bind(that.book)
             }, options)
         );
     })