Not all the web site can be translated into localiced languages. You can only translate
this page (spanish version) (which is similar to
this english page). To do that, you need Patchou sends you a special file that contains all the texts. I don't think there would be any problem if you contact him by email: mplus-trans
patchou.com
For example, we, the spanish members, have translated nearly all the web site into spanish (
es.msgplus.net), however I don't see a real reason why you should do that. Translating only the mail localiced page into your language is enough
BTW, all this is under Patchou's agreement. I can't assure you that he'll send you the file needed to translate the site. I don't think so, but he may not be interested in adding more translations