Audit errorMessage not i18n'd

[exterkamp]

Per Audit errorMessage are not i18n'd.

Who thought they could catch all i18n errors in 1 PR #6457 😢

      // Errors become error audit result.
      const errorMessage = err.friendlyMessage ?
        `${err.friendlyMessage} (${err.message})` :
        `Audit error: ${err.message}`;
      auditResult = Audit.generateErrorAuditResult(audit, errorMessage);
    }