Added polish translation

Created by:
- M. Kucharskov (added in contributors)
- P. Kowalczyk (no added cus, she don't have XDA profile)
Detect dimming, broken right now
Plugin download implementation
Merge pull request #73 from kqstone/miuiv5

MIUI V5 support
Merge pull request #72 from Kucharskov/master

Added polish translation
SystemProperties is private API, use reflection instead.