YOU SAID:
Don't say goodbye tonight
INTO JAPANESE
今夜別れしないでください。
BACK INTO ENGLISH
Goodbye tonight do not.
INTO JAPANESE
さようなら今夜はありません。
BACK INTO ENGLISH
Goodbye tonight.
INTO JAPANESE
さようなら今夜。
BACK INTO ENGLISH
Goodbye tonight.
That didn't even make that much sense in English.