Teleport trap

To. #5745
Previous request # 5821 removed because of my mistakes in working with
git.
Fix typo
can't scatter a telepad, place
Fix message

I thought that in
> string_format("You place the telepad on the %s.",g->m.tername(posx, posy).c_str());
%s will be changed for terrain name in pos. (posx, posy)
space
Merge branch 'Telepad' of https://github.com/ChunkOfMeat/Cataclysm-DDA into ChunkOfMeat-Telepad