Fixed bug in which a check logs multiple LocalizedMessages with identical

line, column, and key; and only the first such message is added. For
example, this occurs with TranslationCheck.

src/checkstyle/com/puppycrawl/tools/checkstyle/api/LocalizedMessage.java

@@ -270,7 +270,7 @@ public final class LocalizedMessage
         final LocalizedMessage lt = (LocalizedMessage) aOther;
         if (getLineNo() == lt.getLineNo()) {
             if (getColumnNo() == lt.getColumnNo()) {
-                return mKey.compareTo(lt.mKey);
+                return getMessage().compareTo(lt.getMessage());
             }
             return (getColumnNo() < lt.getColumnNo()) ? -1 : 1;
         }