Missing an i18n key which comes from Crowd that results in cryptic error message

To repro:

• Setup JIRA
• Add "confluence" in the Other Applications section in admin to allow Confluence to use JIRA for user management
• Setup Confluence on another machine
• Add "Atlassian JIRA" user directory
• Setup url, appname user and password
• Click "Test settings"

Expected: An error message that says: "Client with address 'X.X.X.X', and hostname 'X' is forbidden from making request to the application 'confluence'"

Actual: HTML response is printed encoded with message that says "Access to the specified resource (client.forbidden.exception) has been forbidden" (look at attached screen shot.

Notes:

• The problem is that JIRA is missing an i18n key in JiraWebActionSupport.properties file that comes from Crowd.
• In Crowd, the resource looks like this:

  client.forbidden.exception=Client with address "{0}", and hostname "{1}" is forbidden from making requests to the application, {2}.
  

• This key is used when a client fails the IP validation during a call to JIRA/Crowd's user management REST service