gistfile1.js

    updateVersionDropdown : function() {
        var versionsByLang = {};

        // Group versions by language, and sort the lang keys alphabetically.
        _.each(_.groupBy(_.sortBy(this._versions.models, function (ver) {
            return ver.get('lang'); 
        }), function (ver) {
            return ver.get('lang'); 
        }), function(version, lang) {
            // Sort the versions within each lang group,
            // and populate the new versions object.
            versionsByLang[lang] = _.sortBy(version, function(ver) {
                return ver.get('display_abbreviation');
            });
        });
        
        var selectorHTML = ABS.jst.PassageVersionSelector({
            versionsByLang: versionsByLang,
            current:        this.collection.primaryModel.get('version')
        });

        this.$('div.change-version').empty().append(selectorHTML);
    }