Hi Davide,
so only Italian team use DDTSS for nearly all the translation work, others team use the e-mail system (without review)... or have I missing something?yes you miss something. Some languages start with translation, years befor the web interfaces started.
have a look at http://ddtp.debian.net/ddtss/index.cgi/xx to get an impression about DDTSS utilization by the various teams. Cheers, Martin