Fix babel quoting for Spanish

The problem, described by Udi, was the following:

  See section 1.10 of babel's manual, on page 12 under
  "TROUBLESHOOTING". There cannot be
  a closing curly brace after a shorthand, and in babel-spanish
  ">" is a shorthand.

Thanks to Udi and Jürgen for the patch.

This is a more general fix than the (now reverted) fix at fa67f709.

For ML discussion, see here:

  https://www.mail-archive.com/search?l=mid&q=rwwvyyvwmx5wwvwhqdaioil32hblkzi7ghokzgekksrf66ww3f%40u6nj3guoayay

lib/languages

@@ -1438,6 +1438,7 @@ Language spanish
 	LangCode         es_ES
 	PostBabelPreamble
 	\addto\shorthandsspanish{\spanishdeactivate{~<>}}
+	\deactivatequoting
 	EndPostBabelPreamble
 End
 
@@ -1454,6 +1455,7 @@ Language spanish-mexico
 	LangCode         es_MX
 	PostBabelPreamble
 	\addto\shorthandsspanish{\spanishdeactivate{~<>.}}
+	\deactivatequoting
 	EndPostBabelPreamble
 End