Translation of gplcart from english to polish (10%, 1957 words)

Hi guys, I've translated 1957 words in "core" file.

It took me about 3 and a half to 4 hours to do it. I'm proud that I can be a part of that project, sort of. I hope you guys appreciate.

Here is the link to the project:
https://crowdin.com/project/gplcart
https://github.com/gplcart/gplcart
https://crowdin.com/project/gplcart/pl/activity

Proof

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