Added Polish translation

[jcabak]

[dhoko]

Hello :wave:

Thx for your contribution, we didn't merge as we manage the translations via crowdin (and SimpleLogin was not inside, yet).

We added it and also moved your translations there, if you want to contribute from crowdin you can follow this guide Help us provide online privacy tools in your language

It doesn't speak of SimpleLogin (we need to update the page :wink: ) but the files are inside crowdin