i18n.js

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define(['jquery', 'elgg', 'sprintf'], function ($, elgg, sprintf) {

    var translations_data = [];
    
    return {
        reset: function() {
            translations_data = [];
        },
        
        initLanguage: function(language) {
            language = language || elgg.config.current_language;

            if (typeof translations_data[language] !== 'undefined') {
                // only init a language once
                return;
            }

            $.ajax({
                url: elgg.get_simplecache_url('languages/' + language + '.js'),
                dataType: 'json',
                async: false,
                success: function(translations) {
                    translations_data[language] = translations;
                }
            });
        },
        
        addTranslation: function(lang, translations) {
            if (typeof translations_data[lang] === 'undefined') {
                translations_data[lang] = {};
            }
                
            $.extend(translations_data[lang], translations);
        },

        echo: function(key, argv, language) {
            //echo('str', 'en')
            if (typeof argv === 'string') {
                language = argv;
                argv = [];
            }

            this.initLanguage(language);
            
            //echo('str', [...], 'en')
            var dlang = elgg.config.current_language;
        
            language = language || dlang;
            argv = argv || [];
        
            var map = translations_data[language] || translations_data[dlang];
            if (map && (typeof map[key] === 'string')) {
                return sprintf.vsprintf(map[key], argv);
            }
        
            return key;
        }
    };
});