According to Alexa, Spanish is the second language for Wikipedia considering the amount of traffic it generates. There must be MANY people who use the Spanish Wikipedia. When you look at Betawiki, there are 20 people who indicated there wish to help with the localisation of Spanish.
We are looking for people who speak Spanish, who are willing and able to help us with the localisation of MediaWiki into Spanish. Not only the WMF extensions (41.29% ) but also the MediaWiki core messages (91.84%) are in need of attention..
When Spanish is not your "language", you may want to check out how your language is doing..