Fix /l and /unlock, uniform undef. target returns

If the target of /lock and /unlock doesn't exist, they return "User undefined not found."
Also made all the mod commands with targets that don't exist return the same message as /roomban does for consistency.

Bring back change from commit d1ed6f7

Actual d1ed6f7, /unlock and /unban offline users

Fix /l and /unlock, uniform undef. target returns
Merge pull request #955 from Morfent/patch-2

Fix /l and /unlock, uniform undef. target returns
Hardcode Huntail Illegality

Shell Smash + Sucker Punch
Merge pull request #959 from sirDonovan/patch-3

Hardcode Huntail Illegality
Actually fix Mold Breaker+Slow Start

It wasn't fully done in https://github.com/Zarel/Pokemon-Showdown/commit/c6dc05d66df474fcf2d3e253476e2aed56e80d1c
update
Merge remote-tracking branch 'upstream/master'