CC-4692: Update jquery.jplayer.min.js to version 2.2
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 2.3.x
Merge branch '2.3.x' of dev.sourcefabric.org:airtime into 2.3.x