Board Thread:Support Requests - Getting Technical/@comment-26437440-20150724063608

As there'a a lot of Japanese names and stuff on my wiki, I wanted to incorporate the Nihongo template (like the wikipedia one). I've copied the source as-is for testing and seem to be using it correctly, but I end up with a line break after the translated text and a box that stretches the page, seen here

Just wanna know what I might be doing wrong? Template link is here 