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 branch 'cm-10.1' of github.com:PAC-man/android_frameworks_base into cm-10.1