If it is true no doubt you will find info about that on the MS Official FS 2004 page @

http://www.microsoft.com/games/flightsimulator

If you don't find it mentioned there I would question your source & take note 

If spanish version came out i hope microsoft of Venezuela or their distributor has brougt direcly here and not by independent importers what i see dificult.Last year i bought FS9 in english version,and of course due restriction to the dollar here, i did had to pay it very expensive more than $50 I did many sacrifices to earn the money due that was the only way I could  get it believe or not,recenly they released the change from Bolivares to U.S.dollars only for a credit card,wich i dont have any of them,I been saving to buy combat fs 3 in a local  $60,if there is a spanish version im gonna want to get it,and believe me Its very hard to earn the money here due to political problems...Yes i Know not political stuff here,its  kinda discharge some kinda fustration among friends,you must feel lucky you can buy easyly it almost every where and at the right price