I love Japanese. I love it so much that I (accidentally?) moved to Japan.
But it really has nothing to do with programming. It's a natural langauge with all the idiosyncrasies of natural languages. In fact I'd say that English in comparison feels like a man-made language purpose built for math and technology.
In my opinion, commit messages should clarify the intent of WHY you changed things. I can already see WHAT you changed from the diffs.
But of course, any tool can only work with the what, they cannot know that these lines are related to a bug report filed in a technically unrelated system.