Bug 24872: Set languages prefererences after install

Bug 24872: Set languages prefererences after install

This patch set 'languages' and 'opaclanguages' system
preferences with the language used during install.

To test:
1. Apply the patch
2. Do a clean install in a language other than english
3. Verify that 'languages' and 'opaclanguages' system
preferences show the language code used during install,
besides english.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>