In what is hopefully the last update in a while the StressFree Webmin theme version 2.04 is available. This release applies some spit and polish to the previous release by fixing a few browser bugs, internationalising strings and adding some missing images/styles.
One more thing, if you do not like the new "Installed Modules" menu system you can change back to the old system by editing the theme-stressfree/config file and setting the old_menu parameter to 1.
The updated theme can be downloaded from here.