It is important to note that you need to correct version of language of WordPress installed for the localization files to work. For a localized version of WordPress, please find your language from WordPress' official list.

The first thing you need to do is download the correct version of the localization files. A list of all the official localization files is provided in a specific forum thread. If your language is not available and you would like to add it, please read up on how to do that.

Please double check your version of Google Analyticator and ensure that the .mo & .po files you just downloaded are for that version. Once you are positive you have the correct files, drop the .mo and .po files into your wp-content/plugins/google-analyticator/localizations directory. If you have done everything correctly, WordPress will handle the rest. Enjoy!