STR-2013: Add Spanish translations

Files:
added: /struts/struts1/trunk/core/src/main/resources/org/apache/struts/action/LocalStrings_es.properties (try)
added: /struts/struts1/trunk/core/src/main/resources/org/apache/struts/util/LocalStrings_es.properties (try)
added: /struts/struts1/trunk/core/src/main/resources/org/apache/struts/action/ActionResources_es.properties (try)