Splitted "Self muted/deafened" into seperate message events.

Self muted/deafened message seperated into self muted, 
self unmuted, self deafened, self undeafened. Grants an audio feedback what mute/deaf-state is active. (global keys)
German translation added for these new messages.

Update 03.01.2012:
  - Moved the new message-events to the back of the message-list to prevent old config files from becoming imcompatible.
     - In my tests it worked both to switch from old to new and from new to old.
  - Added an array that allows to choose the order of the messages in the settingsscreen
  - Fixed English/German translation files