Polish 5.6 translation - 100% done !

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Hello everyone, I've made full translation of the most recent C5 version - 5.6 ! I've uploaded it to the Transifex, where we have polish translators group.

https://www.transifex.com/projects/p/concrete5/language/pl_PL/...

Feel free to post translation mistakes, I will fix it as fast as possible.

grosik