Just mentioned that it's impossible broski.
If you're looking for translation software, not going to happen, you'll get wrong words and horrible grammar and sentence structure and the movie will just be a hilarious mess.
You say it's impossible, yet it's a Japanese movie translated to some Chinese language, so it was already translated, you may have to give in a few days or weeks/months for a subfile
to be created, but someone will do it, you wont get a quick instant fix, you will need to wait.
As noted above, if the previous translation is encoded into the video stream, you will never remove that, at best you can only cover it up or crop it out
But looking at size and placement, neither of those options are ideal.
EDIT: Or learn Mandarin and/or Cantonese.