Can you take a look at https://wiki.openstreetmap.org/wiki/Good_changeset_comments ?

There appears to be translation at https://wiki.openstreetmap.org/wiki/JA:%E5%A4%89%E6%9B%B4%E3%82%BB%E3%83%83%E3%83%88%E3%81%AE%E8%89%AF%E3%81%84%E3%82%B3%E3%83%A1%E3%83%B3%E3%83%88