Nice, I wonder how the banner would work for menu or any complex screen that's not a single sentence.
In the past, I've used MORT to play some Japanese MMO game. In-place overlay makes it easier to actually play the game instead of doing dictionary lookup on the side.
These days I stopped using realtime translator and just embrace the slow pace of learning these languages while enjoying the game story.
MORT: https://github.com/killkimno/MORT