update de_DE .po file

merged and revised version (de_DE, de_AT)
CC-5241: deleting a linked show, show comes back in the schedule
CC-5240: Overnight Linked Shows, newly generated not getting content
Updated ko_KR po file. Thanks James Moon!
Updated dependency versions
CC-5245: It's able to edit contents for current ON AIR linked show
CC-5244 : Exception when creating Smartblock
Merge branch '2.4.x' of dev.sourcefabric.org:airtime into 2.4.x
Merge branch '2.4.x' of https://github.com/danielhjames/Airtime into 2.4.x
Merge branch '2.4.x' of https://github.com/bitdevil/Airtime into 2.4.x
CC-5246: Calendar: ON AIR show has an incorrect context menu
Merge branch '2.4.x' of dev.sourcefabric.org:airtime into 2.4.x
[CC-5248] Configure PHP during airtime-full-install on Apache server
Correct php5 config directory and create web root to avoid Apache error
More verbose log messages for airtime-full-install
CC-5247 : Single file audition pop-up has non-functional forward and reverse buttons
CC-5251 : Playlist length is not shown in Library
CC-5251 : clrf
CC-5254 : Listener Status for SHOUTcast doesn't work
CC-5254 : Listener Status for SHOUTcast doesn't work

clrf