Yeah there’s a lot of language rules that native English speakers just automatically know, which I guess is why we don’t really get taught much English grammar at school (I did a TEFL course a few years ago and it was the first time any of us got to learn about English grammar). As I say, not really a problem for people writing on the internet etc. and yeah language evolves, but if you’re a professional writer (this includes translators) you need to get your grammar and punctuation right.