Debian Edu Buster manual: another round of translation updates

Hi Wiktor,

After the previous round of translation updates for the Debian Edu
Buster manual two months ago, it has been completed on a number of
places.
As a consequence the Polish translation of the manual has currently 106
fuzzy translations and 1114 untranslated messages.
There will be definitely another upload of the debian-edu-doc package
on May 1st and maybe another one on the first of June.
So it is still worth the effort to give the Polish translation another
update, if you could find some spare time to devote to it in the coming
weeks.

Thank you for your work on Debian Edu.
On behalf of the Debian Edu team.