I can tell you only speak one language, or maybe another Latin based language in addition to English. If you’d learned something like Mandarin, you’d understand how complex, regional, and historical language is. It’s based on layers and shifts constantly. Sometimes, that’s specifically because people don’t want to be understood by everyone.
I really recommend reading academic books about this topic if you are curious. My favorite is Neurolinguistics and Linguistic Aphasiology, by David Caplan. You may also enjoy Chomsky’s works because he talks about commonalities in language or universal language.
There’s no need to formally codify those hand gestures, because we innately already understand and make them. Making eating motions (which may look different depending on regional utensils) is pretty universal right? But it looks different in different places.