As a non-native English speaker, I've only ever referred to "1700-talet", meaning "the 1700s" or "the 18th century".
In English, it's by far most common to say "18th century" to refer to the years "1700-1799". My brain, even to this day, keeps thinking of the "1800s" when somebody says "the 18th century". I have to actively make an effort to force-retrain my brain each and every time.
I extremely rarely hear anyone say "the 1700s" in English.
I understand that the first century was years 0-99, so that's why the "100s" are the "2nd century". But still. This way of referring to centuries just doesn't exist in my language, or, if it does, I've literally never heard or read it. I'm unsure how common it is outside English in general.
You can imagine how confused I used to be as a child seeing "20th Century Fox" at the end of The Simpsons in the 1990s: "Huh? Is this show from the future?!" And then they changed it to the "21st Century Fox" after year 2000, so the confusion continued...