[3095] Update message id description

src/lib/python/isc/util/util_messages.mes

@@ -16,10 +16,11 @@
 # of the libddns_messages python module.
 
 % UNHANDLED_EXCEPTION program terminated with exception %1: %2. More info in %3
-A program encountered unexpected situation and it didn't know how to handle it.
-It terminated. The exact problem is signified in the message. This might be
-caused by a bug in the program, broken installation, or just very rare
-condition which wasn't handled in the code. A full stack trace is left in the
-given file. If you report a bug for this exception, include that file. The file
-will not be deleted automatically and you may want to remove it when you no
-longer need the information there.
+A program encountered an unexpected situation and terminated because it
+didn't know how to handle it. The exact problem is logged in the
+message. This might be caused by a bug in the program, a broken
+installation, or just a very rare condition which wasn't handled in the
+code. A full stack trace is left in the generated file. If you report a
+bug for this exception, please include that file. The file will not be
+deleted automatically and you may want to remove it when you no longer
+need the information there.