Add translations automatically to your module's CSV.

HelperTranslate.php

<?php
class Ho_SimpleBundle_Helper_Data extends Mage_Core_Helper_Abstract
{
    public function __()
    {
        $args = func_get_args();

        $string = array_shift($args);

        $expr = new Mage_Core_Model_Translate_Expr($string, $this->_getModuleName());
        array_unshift($args, $expr);
        $result = Mage::app()->getTranslator()->translate($args);
        if ($result == $string) {
            $this->_addTranslateStringToLog($result);
        }
        return $result;
    }


    /**
     * Write unfound strings to the modules en_US/filename.csv
     * @param string $text
     * @internal param string $locale
     */
    protected function _addTranslateStringToLog($text)
    {

        $translatecsv = Mage::getBaseDir('locale') . DS . 'en_US' . DS .  $this->_getTranslateFilename();
        if (!file_exists($translatecsv)) { // new translation file
            mkdir(dirname($translatecsv), 0777, true);
            if ($fp = fopen($translatecsv, "wb")) {
                fwrite($fp, "\"{$text}\", \"\"\n");
                fclose($fp);
            }
        } else { // file exists, only write string if not exists
            $execgrep = exec('grep -- \''.$text.'\' '.$translatecsv);
            if (empty($execgrep)) {
                if ($fp = fopen($translatecsv, "a")) {
                    fwrite($fp, "\"{$text}\", \"{$text}\"\n");
                    fclose($fp);
                }
            }
        }
    }


    protected $_translateFilename;
    protected function _getTranslateFilename()
    {
        $nodeName = strtolower(str_replace('_Helper_Data', '', __CLASS__));

        if (is_null($this->_translateFilename)) {
            foreach (Mage::app()->getTranslator()->getModulesConfig() as $moduleName=>$info) {
                /** @var Mage_Core_Model_Config_Element $info */
                if ($moduleName == $nodeName) {
                    $this->_translateFilename = (string) $info->files->default;
                    break;
                }
            }
        }

        return $this->_translateFilename;
    }
}