At this moment , Site@School supports:

1. English,
2. Spanish (thanks to Gabriel Campos, Stephen James),
3. Brazilian-Portugese VACANT
   
4. Norwegian (thanks to Henry Jovik),
5. Dutch (that's us), Peter, Karin, Dirk
   
6. Swedish (Thomas Karlsson )
   
7. German (thanks to Jurgen Goldmann)
   
8. Chinese, (thanks to Jinhe Pei),
9. Japanese VACANT
   
10. Turkish, (thanks to Ylker Turen),
11. French, (thanks to Jean Peyratout),
12. Polish VACANT
    
13. Finnish (thanks to Timo Tervo),
14. Danish (thanks to Ole Bang Ottosen),
15. Italian (thanks to Enrico Centenaro).
16. Bulgarian (thanks to Stefan Stefanov) available in 2.3
17. Hungarian (thanks to Gabi Beni) download Here
18. Czech
    

Languages are incorporated in S@S new releases. Check our Sourceforge download site to see if new languages are available.
You can help primary school pupils in your language to translate Site@School. The system provides an easy 'Translate Tool' for 'on the fly' translations. See page 2 of the Screenshots