A new interpretation of Isaac Newton's first law of motion suggests that a mistranslation has been overlooked for centuries. Newton's original wording in Latin indicated that bodies only change their state of motion due to external forces, clarifying the relationship between his theories and Einstein's theory of relativity. The confusion arose from a translation made after Newton's death that used the word "unless" instead of "except insofar."

https://www.scientificamerican.com/article/mistranslation-of-newtons-first-law-discovered-after-nearly-300-years/