I know of three, though he has said he speaks "about half a dozen"
English
French
Portuguese
He almost certainly speaks Spanish and German would also be very likely.
He also speaks Pidgin (if that can be considered a language; it's how he communicated in Papua New Guinea), plus a Congo River trade dialect whose name I forget. He's seen in an episode "brushing up" on that language.
[caveat: Wade doesn't seem one to put on airs but River Monsters is still a reality show, so we should be suspect at assigning him an ability to speak a local language, even if he "seems" to be conversing one-on-one with locals).
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he did not
Jeremy Wade, from the TV show River Monsters, has not publicly stated his sexual orientation.
I don't think he does
Yes, I know he has at least one brother because he is my maths teacher at school. I believe two brothers and a 'little' sister. Martin Wade is a photographer and the brother he has travelled with most.
He was arrested for supposedly spying in Malasia, this was false, obviously. He just had high-tech gear while he was fishing and the cops thought he was a spy.