I am suddenly reminded of how, after a few months studying in an Israeli religious school, I switched my note-taking from English to Hebrew--not because I was terribly fluent in Hebrew, but because the books I was studying (canonical Jewish texts) were in Hebrew and Aramaic, and the terms used to refer to concepts in them were Hebrew, and it was just easier to write everything in Hebrew than to think about how to translate or transliterate all the vocabulary into English. Especially since the equivalent English words all took longer to write.