Something to keep in mind: Scanlation in and of itself is in no way "Illegal" in most western nations. I mean... Yeah, maybe it carries the death penalty in fucking Rwanda or something absurd like that, but in America and other nations it's perfectly legal.
The issue is if it's a copyright violation. Which is not criminal law (unless you do something criminal with it that is, which this doesn't qualify).
Scanlation absolutely qualifies under Fair Use as well. One of the criteria for determining Fair Use is if the altered work is transformative. Changing the language and localizing something is pretty transformative. Another criteria is does the altered work impact the market of the original work. Are Japanese people ditching the primary sources of Japanese manga to read English fan scanlations? Fuck no. And reason fan translations exist in the first place is because so few series get scanlated and released. So it's Fair Use.