[lang] update of internal addon language files
[lang] update of core language files
[lang] update of skin.confluence language files
[DualAudio] Update README info
[DualAudio] make Audio Engine Interfaces support 2nd audio
[DualAudio] make Audio Engine Utilities support 2nd audio
[DualAudio] make Audio Engine ffmpeg encoder support 2nd audio
[DualAudio] implement ActiveAE code for 2nd audio
[DualAudio] create 2nd Audio Engine instance for AEFactory
[DualAudio] add detection of NULL audio sink for failsafe
[DualAudio] add 2nd audio settings to xml configuration
[DualAudio] implement code of 2nd audio for GUI settings
[DualAudio] implement 2nd output of GUI sounds
[DualAudio] dvdplayer: 2nd codec and stream manipulation