We don’t really know much about what Matt Murdock studied in school except for that he eventually graduated with a law degree. One thing that seems certain though, is that French was likely on his list of electives. While it was hinted in New Avengers #16, by Brian Michael Bendis and Mike Deodato (the issue when Daredevil fights Nazi-robots and joins the team) that Matt speaks German – at least if Jessica Jones is to be trusted – he has been caught speaking French “on panel” several times. See them below!
Daredevil versus voodoo practitioners
Daredevil goes up against forces greater than himself in Daredevil #310, by Glenn Alan Herdling and Scott McDaniel, which was part of the Infinity War crossover, but he seems to have a decent handle on the language at least. In his own words:
French was never one of my best subjects, but I know enough to understand these goons, even through their Haitian dialect.
Daredevil goes deep undercover in Paris
The Flying Blind arc, written by Scott Lobdell with art by Cully Hamner came right at the end of volume one and spans issues #376-379. I’ve mentioned this story arc in another post so I won’t go into the details except to say that it basically revolves around Matt having his brain rewired by S.H.I.E.L.D. This not only restores his sight(!), but has him believing that he’s a frenchman by the name of Laurent Levasseur. I think we can assume that some of his language skills (he’s able to pass for French…) are part of the rewiring, but it probably didn’t hurt that he had a foundation to build on.
“I’m trying to concentrate on the conversation in front of me. But it’s difficult. It’s as if… As if I can hear every word – every sound – on the waiting area outside. […] Oddly enough, It’s all in French. Odder still – I find that odd. I mean, I’m French. Right?”
Torture by American accent
After Matt breaks out of prison early in Ed Brubaker and Michael Lark’s run, he heads back to Paris as part of a trek around Europe in search of Foggy’s killer (Foggy was presumed dead at the time). Here in Daredevil #90 (vol 2), he is seen doing his regular routine. In French:
“Je ne peux pas promettre que vous atterrirez dans la rivière…”
The exchange ends on a very humorous note when the man dangling above the river begs him to switch to English.
There may be other cases I’ve missed, but I think the above instances pretty much cover it. As a well-versed and well-traveled man, I wouldn’t react too strongly if writers come up with new languages for Matt to have at least some very basic proficiency in, but I can’t remember seeing other languages spoken by him being featured in the comics. If you can think of any, let the rest of us know!