Update Italian installer sample files for 17.05

Update Italian installer sample files for 17.05

Update and translate sample SQL file of the Italian installer.

To test:
- Start with an empty database
- Install it-IT
- Run the web installer in it-IT/Italian
- Verify all files, especially sample notices, sample_frequencies,
  sample_numberpatterns load without any problems.

https://bugs.koha-community.org/show_bug.cgi?id=18456

While applying I got a 3-way-merge. Verified in staff client places
mentioned above, notices, frequencies, sample_numberpatterns, HSBND_FREQ
Works as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>