Set temp on Ubuntu to Celsius

Hi

I installed on a room a Netbotz device, that among other things, shows the temperature. I use Ubuntu to access the web interface of the product, and the temperature is shown in Fahrenheit but I wanted in Celsius.
Netbotz manual says the temp format is taken from the computer running the browser, which it's true, cause I access from a (ugh!) Windows and the temp is correctly displayed.

Here's the question. How can I change my Linux config to show temperatures in Celsius.

Thanks!!!