Request for adding Polish translation to doc's build script

[Łukasz Wojniłowicz]

Hello,

please add translations from
https://l10n.kde.org/stats/gui/trunk-kf5/team/pl/websites-docs-krita-org/
to the build script as mentioned at
https://docs.krita.org/en/contributors_manual/
krita_manual_readme.html#translating
in order for them to appear at
https://docs.krita.org/en/index.html

It's complete in terms of translated strings, but needs some polishing right 
now. I would like to make it in published form though.

Thank you in advance.

Regards
Łukasz