Non-awesome hacks? Lots of them, of course!
But I just wiped whole Download folder to test and those "Private Strings" show up in vanilla game as well.
Maybe this problem is related to the fact, that I finally bought OFB and installed it on top of Pets and Seasons? I knew it was probably a VBT, but I wanted to play it as quick as possible and decided I'd reinstall everything later. Yes, you guessed, "later" did not come yet.