Obviously not the first place in the world to have this problem, but Lincolnshire wildlife park has 8 grey parrots and they have started swearing.
The zoo has in the past, isolated the bird, in the hopes of this behaviour not spreading. Now they are trying a different tack, by putting the rude birds in with many more, in the hopes that these birds will learn some more polite words from the rest of the bird flock
This video shows them using a swear word almost instantly.
As you can see, the parrot will mimic any language, and so this is not the first time, and wont be the last.