I am agree with Jun and Chris. Using Japanese words when we talk about Aikido (I think it is the same for the others martial arts) is normal. I don't see how to do without them. In addition, some Japanese words can't be be easily translated in our maternal language. An english translation of the word could be very different from the french one. Using only one word in especially the Japanese word, allows that everyone unsderstand the same meaning.
My english is not very good, but when I see in a topic a Japanese word that I use in my Aikido training I understand.