Just in case people don't understand my English, could you please put a Japanese translation of my email with it?
ーJust in case people don't understand my English, could you please put a Japanese translation of my email with it?
「みんなが私の英語を理解できない時のため、メールに日本語訳を入れてもらえますか?」
just in case で「念のため・もしもの時」
Japanese translation で「日本語訳」
to put a Japanese translation of my email with it で「メールに日本語訳を入れる・つける」
ご参考まで!