NLS: Sync'd with Translation Project

Sync'd with Translation Project. Polish translation updated.

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>
sysstat 11.1.2

sysstat version 11.1.2 final packaging.
lsm and spec files updated.
Changelog added.

NOTE: A stable version (11.0.2) also exists and will be available for
download from my web site:

http://pagesperso-orange.fr/sebastien.godard/

The stable version includes only the bug fixes added in sysstat 11.1.2
but not the new features.

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>