Pull request: Use English "singular they" at a few places

I just noticed a few usages of male pronouns when referring to attackers or users. The attached patch changes these by employing the English singular they, which I believe to be a simple and elegant solution.

I don't want to start a religious discussion. I just had a couple of seconds to spare to prepare this patch; merge if it deems fit or close if it doesn't.

Trac:
Username: iblech