I looked at the site and see no reason why the plugin should not work. Please reactivate it so we can take a look.
Please note that some of the widget text is pulled from the Theme PHP files or from the wp_options table in your WP database. Our plugin may not be able to translate all of those texts automatically and you may need to localize the theme and/or widget(function which are supported in WordPress, please see http://codex.wordpress.org/Translating_WordPress for more details). Some themes are localization-ready and some themes even come with translated PO files which you can just download and copy to your server. It depends on which theme you are using. As far as the widget text, some custom adjustment of the code in the wp_options table may be needed.
Let's first see what is being/not being translated and then we can decide how to proceed.