Adding a javadoc note regarding LANG-882

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1470384 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/lang3/text/translate/LookupTranslator.java

@@ -22,6 +22,10 @@ import java.util.HashMap;
 
 /**
  * Translates a value using a lookup table.
+ *
+ * NOTE: This class is broken for any CharSequence implementation that does not define 
+ *       equals(Object) and hashCode() methods as the class uses the CharSequence as 
+ *       the key to a HashMap. See http://issues.apache.org/jira/browse/LANG-882.
  * 
  * @since 3.0
  * @version $Id$