Todo:
  - Merge HAL 0.5 support 
  - Don't detect avahi if we don't support the API

Thanks !

The default refresh rate of osdmenu is 200 ms with a 15s timeout. The update is needed for remote viewing of osdmenu over udp.

* hopefully fixed the incorrect display of my translation of "Full bass and treble" for Dandruff finally

(the po-files don't need to be updated once again because of this edit)

* modules/audio_output/directx.c: use s16l mode by default since it looks like directx has better latency reporting in this mode.

plugin.cpp: eclipse "one-instance" option in saved preferences, which prevents activex plugin from working properly if a player or another activex plugin is already running. 

* updated the po-files, since all expected translations arrived. Added some last-minute fixes to the German translation.