Add Spanish locale, by Guillem Borrell.

CHANGES

@@ -66,6 +66,7 @@ New features added
     * David Larlet -- French
     * Michał Kandulski -- Polish
     * Yasushi Masuda -- Japanese
+    * Guillem Borrell -- Spanish
 
   - The new config value ``highlight_language`` set a global default for
     highlighting.  When ``'python3'`` is selected, console output blocks

sphinx/locale/es/LC_MESSAGES/sphinx.js

@@ -0,0 +1 @@
+Documentation.addTranslations({"locale": "es", "plural_expr": "(n != 1)", "messages": {"Search Results": "Resultados de la b\u00fasqueda", "Preparing search...": "Preparando la b\u00fasqueda", "Your search did not match any documents. Please make sure that all words are spelled correctly and that you've selected enough categories.": "La b\u00fasqueda no dio ning\u00fan resultado.  Por favor aseg\u00farese que escribi\u00f3 todas las palabras correctamente y que ha seleccionado suficientes categor\u00edas", "Search finished, found %s page(s) matching the search query.": "B\u00fasqueda finalizada, se han encontrado %s p\u00e1gina(s) que concuerdan con su consulta", "Permalink to this headline": "Enlazar permanentemente con este t\u00edtulo", "Searching": "Buscando", "Permalink to this definition": "Enlazar permanentemente con esta definici\u00f3n", "Hide Search Matches": "Coincidencias de la b\u00fasqueda"}});