I am working in S2 version 6.5 / WP version 3.2.1 and Dutch translations are not working. All of my other plugins are working using define ('WPLANG', 'nl_NL') in the wp_config.php.
I have Installed them in: /wp-content/plugins/ subscribe2/ subscribe2-nl_NL.mo, subscribe2-nl_NL.po. I have double checked it with the subscribe2.php "load_plugin_textdomain('subscribe2', 'wp-content/plugins/' . S2DIR, '/' . S2DIR);"
I have made permissions read all for everyone (and also 777!).
I have tried various versions of the .mo and .po files under http://plugins.trac.wordpress.org/browser/subscribe2/i18n/nl_NL
Still no joy.... Any help out there?