Areku - If you'll refer to a post I made
here, that should help you. It's for a different hack, but it should be enough to help you figure out how to change the commas to periods.

As for figuring out how many queries a page has, I would recommend installing Teck's Microstats hack. Alternatly you could open your admin/config.php file and put the code $debug="1"; right at the end of that file before the ?>. Then you would go to the url http://yoursite.com/forum/index.php
?explain=1. At the bottom of that page it will show you the number of queries and the time it took to execute them.