I could be wrong, but I took several semesters of Japanese for reading/translation in college, worked in an East Asian Library for 8 years, and all the signs I'm finding in screen shots look Chinese to me. It was also a Japanese acquaintance who originally suggested the setting as Hong Kong to me, which is where I'm getting my assumption that the points I'm making might seem reasonable to the original audience. I'm getting kind of weary of arguing about this, but if you find some strong evidence that the signs are meant to be read in Japanese, let me know; it would probably change how I view the movie.
Dialing it back the whitewashing bit, here's an interesting video:
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Top 100 Action Movie Countdown (2015): List | Thread
"Well, at least your intentions behind the UTTERLY DEVASTATING FAULTS IN YOUR LOGIC are good." - Captain Steel