Native English speaker. Some German; enough to not starve, but I think science or engineering would be out of the question. It wasn't in the class. (actually, my last year of German, we read a mystery novel. That didn't work very well either 
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Computer languages: I've been graded or paid for BASIC (several varieties), Fortran, PL/1, Pascal, Assorted Assemblers, Postscript, TECO, and C. I looked at ALGOL and COBOL quite briefly (neither did what I was looking for at the time. And APL. Actually Algol would have, but I coudn't see it from the manual.) I wrote a simulation in MACSYMA. I audited part of a Smalltalk class, back in the Sun-1 days. I've done work on BLISS, MacLisp, elisp, C++, and Java apps without really knowing the languages (including Arduino sketches and the IDE!) I followed Forth with some interest for a while, but never actually wrote much. Some of several scripting languages (BAT, MIC, PCL, csh, bash, tcl.) I've worked on JCL and Makefiles.
After a while, they all start to look alike in a lot of ways. And even if they aren't so much alike, you can make them LOOK alike anyway (not such a good thing, actually.)
Recently I've been experimenting with PERL...