Polish translation update

[Greg-21]

In this pull request, I updated the Polish translation to include all the changes to the source translation strings made since my last update of the Polish translation 2 years ago in commit a52e7ee. I also took the opportunity to improve some of the existing text strings to ensure the highest possible standards of the translations I maintain.

TheIllusiveC4, could you please tell me what other branches you still support so that I know where to backport this translation if it gets accepted in the main branch?

[TheIllusiveC4]

Thank you!

As for the other branches, I can merge your changes into the 1.20.1 branch as well but that's something I can do on my own without needing another PR.

[Greg-21]

It would be great if you could do that. Thank you! Just please note that version 1.20.1 is from before the networking overhaul designed by Modmuss50, so the curios.networking.failed translation key is unnecessary in that version. Everything else should be fine, though.

And by the way, do you also support 1.19.2 by any chance (which still seems to be very popular among modded Minecraft players)? The last mod update for that version was just a few months ago, on July 2, 2024. If you're interested, I can take care of it since there are a few more differences in the source translation strings between 1.20.1 and 1.19.2. But if you're not, that's totally understandable but a bit unfortunate.

EDIT: Actually, I've already done the above in PR #451 in the meantime. Feel free to close it if you don't plan on releasing any updates for that version, though.