Digium has never provided a Spanish language version of extra-sounds. Until fairly recently, the only language provided was English, since that is all that was contributed. The French language version was provided to us by a community member.
Digium recognizes that there are a large number of French and Spanish -speaking Asterisk users, which is why we will happily pay for any new prompts that are required by Asterisk to be recorded in English, French, and Spanish. The prompts in core-sounds are the ones required by Asterisk itself. The prompts in extra-sounds are prompts that have been contributed to us for various reasons over the years.
If a community member were to contribute a properly licensed Spanish language version of extra-sounds, we would be very happy to distribute them along with the English and French versions. Please see svn.digium.com/view/asterisk/tru … iew=markup for details on this.
As for your immediate need… There are community members that have made Spanish language prompts available for free. There are a large number of prompt sets listed at voip-info.org/tiki-index.php … ernational - one of them may include what you require.