Bug 16133: Translatability of database administrator account warning

Bug 16133: Translatability of database administrator account warning

This patch removes sentence splitting of the database administrator warning with
a button styled link.

Additionally, it uses the same wording as in the warning on the 'About' page.

To test:

- Apply patch
- Log in to Staff client as database administration user
- Verify that the wording of the warning is the same as on the About page (Tab
  'System information')
- Verify that the link to the patron administration page is styled as a button
  and behaves correctly

NOTE: Actually, the category is irrelevant. But I like the improved message.
      Categories may or may not be set up at the initial log in.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>
(cherry picked from commit e53b80dedf91617f9eecb9defd2d6f5222f03d65)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>