I do that as well and also in almost all my personal documents on most (but not all) topics. All the books and most online forums I read are in English. I rather have documents uniformly in Swedish English (en-SE?) than some Swenglish mess of Swedish mixed with English words.

It also helps on the rare occasions some random notes evolve into a proper project that will have to be in English eventually anyway. There is no need for an extra translation step between initial idea and final product. All my vague hobby gamedev ideas are in English for instance.