Settings: Update Polish translation

PS2: Deleted comments, added mising strings and minor fix
PS3: Added some missing strings, minor change in swaping volume controls

Change-Id: I28580959b55e3531005a07090a5f7aa81e5e8a82
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_packages_apps_Settings into cm-10.1-n7