changed the time in the forum class
Shown Messages:
- posted less than 60 seconds: "Just now"
- posted less than 1 hour: "X minutes ago"
- posted less than 1 day: "X hours ago"
- posted less than 1 weekt: "{weekday} {time}
- all other: "Jan 1st, 2014"

Signed-off-by: N8boy <jannikrenfordt@gmx.de>