Polish Translation & Hide Tray Icon

[BlackOtton]

I translated ThinkPad Assistant to Polish language. Tested everything, works perfectly fine.

[BlackOtton]

About cd59732:

• I fixed polish translation of Wi-Fi. Now when it's being disabled, it actually translates to "Disabled", not "Enabled"
• I added a function that hides tray Icon. From now on, when the assistant starts, it starts with this question:
  
  Translation: Do you want to hide the tray icon?
  If user select Yes (Tak), application starts hidden and shows this notification:
  
  Translation: Assistant started in the background.
  If No (Nie) is selected, tray icon normally show up.

Things to do with this function:

• Translate to other languages (Should be easy as translating OSD)
• Ability to exit the app without having to kill it in Activity Monitor
• Save user selection