Polish locale update (not full - 75%)
Polish locale update (full - 100%)

Contribution of radioaktywne.pl (Lucy Pałys & Marcin Tym-Czarnocki)
Polish locale update (full - 100%)

Polish locale full version.
Merge branch 'devel' of https://github.com/sematuszewski/Airtime into devel
Merge branch 'devel' of dev.sourcefabric.org:airtime into devel