I write all my personal code, including comments, in English and not Swedish precisely because I want non-Swedish devs to be able to perfectly understand the code even without Swedish language or cultural knowledge. Also, thinking and writing in English is much simpler than jumping between two languages.
Personally I've always wrote my code and comments in English, even if I never fully understood why. That said, having studied abroad and returning after graduating I did hit a few rocks: My tech lead at my first job upon returning(the same job when we had to migrate the Romanian database) was telling me how to do something and he said something along the lines of "You take those and shove them into an array" in Bulgarian(my native tongue). As you could imagine, "array" in Bulgarian sounds nothing like that. I nodded with approval(having no idea what he had just said), and google-translated the word he used 5 minutes later. When "array" came up on the screen I felt like someone had smacked me in the head with a sledgehammer.
Regarding the relative usefulness of a well-named method vs an explanatory comment, I think it depends on the culture of refactoring for the codebase. If a codebase sees its code very regularly refactored, then comments can be downright dangerous/misleading while methods are easily renamed throughout. On the other hand, a well placed comment can tell you a lot of “why” or “how-to” that a method name / signature cannot.
Comments can get stale really fast but I probably write at least twice the amount of comments as code because that's how I reason about the function and intention of the code. Sometimes the code seems simple but the reason why it exists can be really complex.
