corrections for PL

[olsza]

• Have you followed the contributing guidelines?
• Have you explained what your changes do, and why they add value to the Guides?

Please note: we will close your PR without comment if you do not check the boxes above and provide ALL requested information.

---

1. "am" remained, which meant that the exact question was not in Polish
2. in nav given the mother tongue "Polski" (in Poland "Polish" is "Polski", that is, in Polish)

[MikeMcQuaid]

Thanks again @olsza!