Translation for PL

[olsza]

• [x] add lang PL to tovdf.js
• [x] achievements translation (progress 100%)
• [x] short page for Steam (progress 100%)
• [x] full page for Steam (progress 100%)
• [x] Full translation PL in languages (progress 100%)

[xsellier]

Hey,

That's an awesome work, I'm gonna rebase those commit, then publish them, update the steam store page. I hope you enjoy the game so far!

Feel free to make any suggestion you want!

[olsza]

I'm happy to help :)I'm sure if I notice something I'll give feedback ;)