Using 1 common language in a sport makes it all easier
Like the use of french in fencing or spanish in Latin American dancing
Using local languages makes it very hard to understand for others
If a high ranked instructor from the UK comes to my country and then uses terms as lunge punch and bowstance, most will be lost as we have no idea what lunge means
In countries where they do not speak any english people wouldn't understand anything at all without an interpreter translating all the time ( so not just when the teacher is explaining)
In Judo we had te system of 1st, 2nd, 3rd etc hipthrow ( kawaishi system) but because I knew the japanese words and their meaning I could figure out what the thow should look like
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Red white and blue striped belt