Translation of 644 words in "Liferay Portal" to polish

Hi guys, I've translated 644 words in "Liferay Portal" project. This work took me about an hour.

Here are all links to the project:

https://crowdin.com/project/liferay-portal
https://crowdin.com/project/liferay-portal/activity_stream
https://github.com/liferay/liferay-portal
https://www.liferay.com/

Proof:
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3 (before)

4 (after)

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