Paste the codes into Control Panel » Customize design » Users » User registration page This code for the *Attention! This website...* part.
Quote
<script>
e=document.getElementsByTagName("div");
for(i=0;i<e.length;i++) {
if(e[i].className=='uNetDescr') {
e[i].innerHTML=e[i].innerHTML.replace('Attention','your language);
}
}
</script>
Quote
<script>
e=document.getElementsByTagName("td");
for(i=0;i<e.length;i++) {
if(e[i].className=='') {
e[i].innerHTML=e[i].innerHTML.replace('E-mail:','your language1');
e[i].innerHTML=e[i].innerHTML.replace('You should specify a','your language2');
}
}
</script>
I gave you basics above on how to do it, if you have questions feel free to ask them.
Excelent!!! 
