Changing pl-PL.yml lang file to new one

[QuestionCatcher]

Hi o/
I saw a few mistranslations in polish language relative to English so i fixed it.
I would appreciate changing the old file on new one for future Devs
pl.PL.txt

[OmerBenGera]

I went through the file and sensed an issue.
You translated -cancel to your own language, however this doesn't make sense as -cancel is what the plugin detects when typed.
You should not translate command names or any other such things that the plugin is hardcoded to look for.