… added "a music" = improper language – where is file located?

Hello,

Welcome to our forum. Please send me a link to a profile link on your site with a music media uploaded and I will give you the solution.

Thank you,
Catalin

Shoot. I had a long response to this but the forum was down when I posted it and it lost it all. Anyhow, short version. That message is controlled by rtMedia so its best to ask over in their forum. Kleo doesn’t do anything with that message. But, you can try this which will probably get you close

function rtmedia_change_added_text( $action, $username, $count, $user_nicename, $media_type ) {  
    $action   = sprintf( __( '%s added %d %s', 'rtmedia' ), $username, $count, RTMEDIA_MEDIA_SLUG );  
    return $action;  
}      
add_filter('rtmedia_buddypress_action_text_fitler', 'rtmedia_change_added_text', 10, 5);