Bug 9841 - Improve the link from the "logged in as mysql-user"-warning

Bug 9841 - Improve the link from the "logged in as mysql-user"-warning

Currently, the link from the "logged in as mysql-user"-warning goes to
add a patron in a seemingly random category code. This patch changes
the link to point to Home > Patrons, where a category for the new
patron can be chosen.

A small typo in the warning message is also corrected.

To test:
- Apply the patch
- Login as the MySQL user
- Check that the warning appears on the intranet home page
- Check that the typo in the first line is fixed: "This *is* a bad idea"
- Check that the link in the warning leads to Home > Patrons

Signed-off-by: Brendan <brendan@bywatersolutions.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
All happy with this.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>