Polish translation of Mission Planer

#### Issue details
_Please describe the problem, or desired feature_

#### Version
_What version was the issue encountered with_

#### Platform
[ ] All
[ ] AntennaTracker
[ ] Copter
[ ] Plane
[ ] Rover
[ ] Sub

#### Airframe type
_What type of airframe (flying wing, glider, hex, Y6, octa etc)_

#### Hardware type
_What autopilot hardware was used? (pixhawk, pixracer, PX4FMU etc)_

#### Logs
_Please provide a link to any relevant logs that show the issue_

The issue names no files, tests, or entry points and provides only the request for a Polish translation. Start by locating Mission Planner's existing translation resources and checking how other languages are maintained; done means the Polish wording is complete and integrated consistently.

Written by the indexing model from the issue text.