i’m not a professional coder, mainly self-taught. however, some years ago i’ve followed some classes, and exactely this was one of the first thing we learned:
no matter what is your native language, in coding the “official” language is english. a worthwhile coder should always use english variable / definition / etc names and english comments. that is a basic rule. otherwise, if anytime someone else - with a different native language - takes over the project, will curse you to death
and believe me, this is true! once, i had to debug / work on a quite big project, which was written by some spanish folks. all the namings and comments is spanish… it was a real pain in the ass and soon i’ve abandoned it.