Translated the entire thing to Spanish

Being from Latin America myself, I thought it would apply. :)

I may have made a *couple* of mistakes here and there with the
accents (´). :P

Also I didn't do anything special with formatting, so if I need
to fix anything please say so. :)
Fixed a little thing in the es.yml file
OK last typo translation fix

...hopefully...
Merge pull request #198 from Greduan/patch-1

Finished 100% the es.yml file