Translate file is located in app/design/frontend/cartown/default/locale/en_US/translate.csv. Use it to translate custom strings into other languages.
For example you need to translate everything to French. Follow these steps:
- install French translation
- create app/design/frontend/cartown/default/locale/fr_FR/
- copy tranlate.csv to a new local folder
- edit with your favorite text editor
- switch store locale to French in System > Configuration > General
- If prompted, flush the cache. Check Magento Configuration > Cache Management.