Update Rule 805 & connected stuff

1) updated rule 805 wording, particularly:
   * if >> falls
   * skip >> überspringen
   * affected >> betroffen
   (TODO: replace everywhere)
2) added definition for "Casual"/"Freizeitspiel" to the glossary
3) replaced all instances of "inaktiv" with "nichtaktiv" throughout the document to be consistent with the renamed ASNAS-Regel