This code simply have to be pasted in your functions.php file to work:
function remove_comment_author_class( $classes ) {
foreach( $classes as $key => $class ) {
if(strstr($class, "comment-author-")) {
unset( $classes[$key] );
}
}
return $classes;
}
add_filter( 'comment_class' , 'remove_comment_author_class' );
Thanks to C. Bavota for this interesting piece of code!
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WordPress hack: Remove admin name in comments class