The url in question is the website of the individual (or team) that does the Romanian translations for the plugin. I don't know Romanian, but their website does not look like it distributes malware. I've sent an email to them to try and get more information, but I suspect it may actually be the ad network they use that was infected, rather than their actual website.
You can delete the file in question, or leave it, it isn't going to hurt anything, since that url never gets displayed anywhere. It also won't break anything, since you are not using the Romanian translation.