Add an error message when a player use teleport without right

Hello everyone, 
A new time I create a pull-request to add this error message when someone try to teleport an other player without the bring privilege but with the teleport privilege. Rubenwardy told me to rebase the both commits I did but I wasn't able to do that, so I gave up and created a new pull-request, including the two modifications and the modifications from the others pull-requests merged after I opened mine. The returned message is "You don't have permission to run this command (missing privileges: bring)", I think it is grammatically correct. I've didn't found any problem with this modifications, tested with 3 clients by every way I could.
So please if something is wrong tell me and I change it.