Yeah, I took a look at your Japanese mode, and while I'm impressed that it works at all, it has some problems with Japanese's high concentration of homographs and homonyms.

First thing I ran into (second character in the text!) was 月, in this case it was part of 夕月(approximately "evening moon"), but it separated the two characters and translated 月 statically as "month" instead of "moon", which it meant in this case.

This stuff can be hard, I've tried for myself and honestly, I'm not up to the task unless I can make a living at it.