chat plugin localization

Dear friends,
I have just translated your plugin completely into my language. I have languages/wordpress-chat-sk_SK.po and languages/wordpress-chat-sk_SK.mo files. But the plugin is still working in English:slight_frown:
Where can be a problem?

Thanks a lot,
Martin

WP Multisite 3.2.1 , wordpress-chat-plugin-1.0.7-BETA-4