Delete Forever error should have better language

Steps:
Create a visit and add an encounter.
Edit visit. Select DELETE FOREVER. This will fail because there's an encounter associated with the visit.
The log shows:

INFO - LoggingAdvice.invoke(117) |2011-11-09 09:26:17,724| In method VisitService.purgeVisit. Arguments: Visit=Visit #2,
ERROR - LoggingAdvice.invoke(126) |2011-11-09 09:26:17,739| An error occurred while executing this method. Error message: Cannot purge a visit that has encounters associated to it
INFO - LoggingAdvice.invoke(142) |2011-11-09 09:26:17,828| Exiting method purgeVisit

Result:
An error message that says "Error occurred while attempting to purge visit"

Should say:
"Error occurred while attempting to purge visit"

Request:
The error message should say "Error occurred while attempting to purge visit. Cannot purge a visit that has encounters associated to it."

Ideally, the DELETE FOREVER button would be disabled and a mouseover message appear explaining that it can't be purged while there are encounters.