Steps to reproduce

1. Create a custom field (of type URL field or text field) and add it to your default screen.
2. Create or edit an issue and do not fulfill some requirements for submitting data to this field (e.g. don't enter any value for a required field or enter an invalid url for a URL field), to ensure that an error message about this field will be thrown in the user interface.

Expected Result

The name of the field should be showin in the error message as seen with a built-in issue field as shown below:

The Actual Result in JIRA 6 currently

The field ID, something like customfield_10000 shows instead of the Field name as shown in the screenshot below