OK. I'm getting closer and closer to the source of this problem.
I've come to realize that Jetpack is the main troublemaker so you can consider the problem closed, from your perspective. But if you still want to take a look at this oddity, you're most welcome.
After the last upgrade, Jetpack started to cause the white screen of death in the plugins page even without your plugin being activated.
After extensive testing, I've noticed that when your plugin was activated some of the Jetpack components cause the white screen of death allover the wp-admin section, while others only caused it in the plugins section, while two of them were causing no problems at all.
Since the ones that cause no problems are the ones that I need most (Contact Form and Enhanced Distribution) I will consider the problem solved.
Just for posterity, I will also repeat that this problem is only present when English is NOT the language of the site.
Odd, I know, but this is the behavior that I get.