SystemUI: Updated Polish translation

Patch Set 2: Added comments above and below CyanogenMod additions
Patch Set 3: Fixed some minor typos

Change-Id: Ie2685b00264afe2503f4c57a3b80e39d83162149
Merge "SystemUI: Updated Polish translation" into cm-10.1
Merge remote branch 'cm/cm-10.1' into cm-10.1