Missing "optional" keyword for atlantis fr and it

[Alexandre Detiste]

Hi,

Thanks, fixed,

I can't think of any games that would require .pdf as game assets 
(or that would be some really boring game,
e.g. "Marketing Plan Simulator 2015")

find /usr/share/games/ -iname '*.pdf' -> nothing

Maybe it's best to had an extra assert to avoid that this error
happens again.


> Hello Alexandre,
> 
> i think i've found another small bug, the documentation files for 
> fate-of-atlantis-fr-data and fate-of-atlantis-it-data are missing the 
> "optional:" keyword, while all other versions do have it. Attached is a 
> small patch for that.
> 
> 
> Bye
> Patrick