updates to polish translation by alzen, also add two unlocalised string he found in the gui
City.ogg=HSR ( http://elhombresinremedio.com )
Compost.ogg=HG
EarthRise.ogg=Jonatan Nilsson
oriental.ogg=Jonatan Nilsson
Rock.ogg=HSR ( http://elhombresinremedio.com )
sdmusic.ogg=Kevin MacLeod - "Hitman" [sheepluva edit]
snow.ogg=Jonatan Nilsson