Load and parse .properties files
function loadAndParseFile(filename, settings, nextFile) {

        if (settings.debug) {
            debug('loadAndParseFile(\'' + filename +'\')');
            debug('totalFiles: ' + settings.totalFiles);
            debug('filesLoaded: ' + settings.filesLoaded);
        }

  	    if (filename !== null && typeof filename !== 'undefined') {
            $.ajax({
                url: filename,
                async: settings.async,
                cache: settings.cache,
                dataType: 'text',
                success: function (data, status) {

                    if (settings.debug) {
                        debug('Succeeded in downloading ' + filename + '.');
                        debug(data);
                    }

                    parseData(data, settings);
                    nextFile();
                },
                error: function (jqXHR, textStatus, errorThrown) {

                    if (settings.debug) {
                        debug('Failed to download or parse ' + filename + '. errorThrown: ' + errorThrown);
                    }
                    if (jqXHR.status === 404) {
                        settings.totalFiles -= 1;
                    }
                    nextFile();
                }
            });
        }
    }