[Curryking]

Ahhhhh don't start nitpicking -]Tical2k[- DooM ;-) , I think the translation is fine and understandable as it is and nearer to the source than yours. Yours would look somelike than

[en]
KICK_AFK_WARNING = You have %s (seconds) to move or you will be kicked due to your absence.

But AFK is well used in german internet- and gaming-communities, so there is no need to paraphrase it.
And please don't add "Sekunden" it's already contained in the variable (%s)

But Brad is up to make the decision. I'm fine with both solutions ;-)

Cheers,
Curry