lalala
Explanation
This comic plays on the word "binary" having two entirely different meanings in two different contexts.
In the setup, one character is amazed that the other speaks French after just one day of practice. The second character then "demonstrates" by rattling off a long string of "LALALALALE" nonsense -- clearly not French at all.
The punchline appears in the caption: "Technically, if you speak binary, you can speak any language." The joke is that the character's stream of "LA" and "LE" can be interpreted as a binary system (two syllables, like 0 and 1). In computing, binary code (sequences of 0s and 1s) can encode any information, including text in any language. So technically, if you interpret "LA" as 0 and "LE" as 1 (or vice versa), you could indeed encode French -- or any other language -- in this two-symbol system.
The humor works on multiple levels: it's absurd on its face (someone claiming to speak French by babbling), but the underlying computer science logic is technically sound. It's a classic SMBC nerd joke that rewards readers who understand binary encoding.