Spanish Support Corrections

Hello!

I've corrected and added to the Spanish language support in the config/locales/devise.es.yml and config/locales/es.yml. Corrections include grammar and orthography and additions include translations of untranslated segments. 

I've made some other changes to other files for my own, personal use that should be ignored. I'm not sure (if it is even possible) how to submit changes to select files. If this is possible, please let me know.

Hasta luego,
Cory