A) A little late now, since as is stated in the letter people are already mirroring the repo B) can the app really be spreading that fast, if people are having to download it from github, and override their devices security settings to install it? Also the words "serious public disorder" send chills down my spine for some reason. It sounds like it's right out of some dystopian movie.
It's unclear who translated the letter. It may have been a github employee.
In the original it says "graves desórdenes públicos" which could also be translated as "grave public disturbances". The word "desorden" definitely doesn't have a medical connotation as "disorder" has in English.