Does language plays a role in equal important, different areas of knowledge?

In my opinion language is just a tool for communicating, so it isn´t important which language you speek to explain people, who are able to understand you, things.
So all in all it dosen´t play a role. Of course there are some words you can´t translate but you can explain them. Important is that two parties can communicat, it dosen´t matter if with hands, language or pictures.