Update about.py (Spanish)

Added by translation made to the Solaar Project.

lib/solaar/ui/about.py

@@ -75,6 +75,7 @@ def _create():
             'Daniel Pavel (română)',
             'Daniel Zippert, Emelie Snecker (svensk)',
             'Dimitriy Ryazantcev (Russian)',
+            'El Jinete Sin Cabeza (Español)',
         ))
     )