Hi iuvenca !
For id|iota, it's a ref to one of the in-game puzzle. If you try to use only one of the two half of the magic word the games answer "Ti capisco solo a metà", 'I can only half understand you'.
I'm also a bit at loss at the detail of the second point you raised, but I believe it might be something like "the IFEngine must be compiled" or "present". In doubt you could always replace the message by "Error with the IFengine" (that's what I did until i find a better solution)
Hope it helps :)