STR-2153: Reveal the offending bean and property name when iterating

Files:
modified: /struts/struts1/trunk/taglib/src/main/resources/org/apache/struts/taglib/logic/LocalStrings_es.properties (try)
modified: /struts/struts1/trunk/taglib/src/main/resources/org/apache/struts/taglib/logic/LocalStrings.properties (try)
modified: /struts/struts1/trunk/taglib/src/main/java/org/apache/struts/taglib/logic/IterateTag.java (try)