Core/Threat: Fix by faq.

Turning gm on, now drops threat.
Dead mobs no longer holds threat on player.
Also fixed some Engrish.

src/server/game/Combat/ThreatManager.cpp

@@ -535,6 +535,10 @@ void ThreatManager::processThreatEvent(ThreatRefStatusChangeEvent* threatRefStat
                     setCurrentVictim(NULL);
                     setDirty(true);
                 }
+                if (getOwner() && getOwner()->IsInWorld())
+                    if (Unit* target = ObjectAccessor::GetUnit(*getOwner(), hostilRef->getUnitGuid()))
+                        if (getOwner()->IsInMap(target))
+                            getOwner()->SendRemoveFromThreatListOpcode(hostilRef);
                 iThreatContainer.remove(hostilRef);
                 iThreatOfflineContainer.addReference(hostilRef);
             }