Is your feature request related to a problem? Please describe.
As far as I see, there are no abbreviations for Spanish texts, which could end up on issues.

I see them for English in https://github.com/NaturalNode/natural/blob/master/lib/natural/util/abbreviations_en.js

Describe the solution you'd like

PR: #761

Describe alternatives you've considered
I can provide some abbreviations.

PR coming soon.

Additional context
Add any other context or screenshots about the feature request here.