Is it just me or is LibBabble* shit for tracing the addon that actually caused the problem? In your case you have an addon, no it's not omen, that is looking for that translation incorrectly, is that even a zone? Is it not a spell?
Anyway, start turning off addons until it goes away. When it does, it's most likely the addons that you disabled. Keep omen enabled so you have a copy of LibBabble-Zone.