Here is a download link for some system software Luma patches that can translate JPN 3DS to English.
I made them because I'm a Chinese and I don't Japanese :)They are tested on my JPN new3DS.
But these only the software, not the Home Menu.
Hope These patches can help you :P...
It's not the movies or games downloads that I would worry about, like breaking into networks, downloading encrypted things, spying on network traffic. I have seen so many "Top Secret" seals on files when I was a kid
I was obsessed with finding UFOs, a surprising amount of US files where stashed on computers in other countries, China back in the early 90s omg sooo much