So you say that current db file can be used with this locale?
Yes! Actually I'm pretty sure the db file used in the newer versions is just a re-encoded copy of the one used in the old versions of SpaceEngine.
I found some weird characters in two places
Oops sorry about that!
My text editor has the bad habit of inserting weird character sequences when you type too fast without making them visible. I'm checking the file with another text editor and I can't find more of those artifacts other than those two you mentioned.
Would you like me to reupload it?
what is more correct? "Spanish - Mexico"? How do I write this in Spanish (in the LocalName parameter)?
Mmm well I'm not a Spanish expert, but I'm pretty sure the Spanish spoken in Latin American countries differ a bit one from the other. I think the safer move to do here is to call it "Spanish - Mexico" (InternationalName) and "Español - México" (LocalName).
By the way if you want you can change the LocalName "Español de España" to "Español - España" for consistency, go ahead. It sounds good to me.