The purpose of this list is to show that I have worked with enough computer and human languages, that I can learn whatever language you require for the job.
The difference between human and computer languages is in their purpose and application. While most computer languages are simpler and more structured than human languages in their grammar, when it comes to their correct usage, they do not lag behind; just think of architectures, patterns, abstractions, and of course, infinite recursion.
Kotlin - I wrote my first Kotlin program for the Kotlin Bootcamp for Programmers Udacity course, and never looked back. It is one of a few programming languages that I actually like, that is, have an emotional attachment to, versus a purely pragmatic relationship based on need.
No developer portfolio without Java and C++, neither of which I am fond of, but I get the job done.
As for scripting, C# for Unity, JavaScript for web, and of course HTML, XML, CSS, some PERL, and various Shell script flavors.
I also written a bunch of code in Python, PHP, and MySQL.
I learned to program in Fortran, Pascal, and later graduated to Modula-2 (Modula-3 and Oberon), so I do feel a bit sentimental about them. Ada was just a side-thought.
My introduction to object oriented programming came with Smalltalk, another programming language that I completely loved at the time, and later Objective C.
For functional programming, we have Lisp flavors.
Finally on the more esoteric side, there is Postscript (Sun's News Window System was written in PostScript), Prolog (used for my thesis), and APL just because it's weird.
I almost forgot awk and sed, Basic, Cobol, and Assembly Language, and I wrote a word game in machine language on a KIM computer.
That mostly covers it, and if yours is missing, I hope you are now convinced that I can pick it up pretty fast.
Being a polyglot doesn't mean 100% fluency in all the languages. I have various competency, and it has changed over time as well. Mostly, languages are fun to learn, more fun to study, and an amazing window into human culture, history, and nature.
English. Mostly the American variety.
German. I am bilingual German/English.
Swiss German. Because that's what my parents speak. I can imitate multiple dialects of competing counties, which used to be great for telling jokes.
Norwegian. Used to be natively fluent speaking, reading, and writing. The oral part got rusty after I lost touch with the social group I was part of. Note that Swedish and Danish are similar enough that they come for almost free with friends.
French. Used to be natively fluent but haven't spoken much. Never got past a C in written, in spite of reading the whole of Les Miserables.
Spanish. Intermediate in reading. More like advanced beginner otherwise. Actively learning. I also studied Italian back in school, enough to eavesdrop on my friends and go traveling.
Russian. I studied Russian for three years and got pretty good at reading and writing, but never much at talking. Unfortunately, that was some time ago now.
Japanese. Full immersion for a few months before a trip to Japan. I love the language, the culture, and the writing system.
Dutch. I learned it as a kid, enough to explain to a cop, in Dutch, that I wasn't lost, didn't speak Dutch, and didn't need help. I can read it.
Latin. It counts because in addition to translating Cicero and Ovid, in my study group we actually talked. Has gathered a lot of dust.
Sanskrit, Icelandic, and medieval German are the staples of students of linguistics, so I had a working knowledge in college. Oh, and hieroglyphs.
I tried to learn Polish, for a business trip, and this is the only language where I fell flat on my face with its difficulty.