Depends which link you are using:
http://orange.gps-trace.com/
On the above there's a language drop down on the menus above the main map.
The other link below (which is the one I think you're using):
https://svcs.gps-trace.com
there is your username in the top right hand corner (I've blanked it out in my example) click on your username to get the dropdown settings box
