Problem after translation

#2 is fixed in the next module build cycle.

Please do not post multiple problems in one issue. They need to be separate.

in function gotcha_form_alter I tried to add a new case: 'contact-mail-user'. But it looks that this form can't be altered. Do you have a solution?

I stuck case 'contact-mail-user': right after the current case statement and it caught my email; I also see that it generated the hidden field. It does not, however, pick up the correct form fields. That would require additional work, which I may get to later - please open this as a feature request.

...translated into Dutch... send an e-mail by the contact page, using about 10 identical links... in the real subject... To my surprise the e-mail was send without any complaint.

Hmm, the code you reference is the title of the subject field, not the subject field itself. The field handling code is almost verbatim from the Contact module. I suspect it passed because the check_plain removes the stuff that would make the Spam filter recognize it as a URL (I think). I have to think about this for a while. I planned on people doing URLs in the body, but not the subject (and I suspect the Contact developers had the same mind-set). Possibly I'd have to make a separate filter call just to scan the subject before doing a check_plain. I think the same oversight probably also exists for the sender's name and email address as well. Hmm...

...translated into Dutch... send an e-mail by the contact page, using about 10 identical links... in the real subject... To my surprise the e-mail was send without any complaint.

Hmm, the code you reference is the title of the subject field, not the subject field itself. The field handling code is almost verbatim from the Contact module. I suspect it passed because the check_plain removes the stuff that would make the Spam filter recognize it as a URL (I think). I have to think about this for a while. I planned on people doing URLs in the body, but not the subject (and I suspect the Contact developers had the same mind-set). Possibly I'd have to make a separate filter call just to scan the subject before doing a check_plain. I think the same oversight probably also exists for the sender's name and email address as well. Hmm...

You cannot have two form fields with the same name (which is not the same as a title). The "#title" for a field is merely a text label that is placed before the input area. So yes, I have two fields with the same label, but there is really only one "Subject" field. The first one is actually called "Private Message" and it should be hidden from view. You should not have been able to enter anything in that field. Had you done so, the message would have immediately been called spam. I have caught several spam bots this way.

I do a little bit of extra processing up front, but otherwise the code is the same as the contact module. What you've told me is that I probably need to do a bit more on the (real) subject field or at least move the check_plain until after it goes through the spam filter. I'm still mulling this over.

Other than that, I think all your other requests are taken care of.