PRINCESS Charlene of Monaco has left hospital in South Africa following treatment for an ear, nose and throat infection, a spokeswoman for the principality's palace has announced.  The princess was admitted to hospital on Wednesday after fainting due to complications from the condition, which was however not a cause for concern, the palace had said. The princess, who swam for South Africa at the 2000 Olympic Games, married Monaco's ruler Prince Albert in 2011 in a lavish ceremony in the principality, a playground of the rich known for its Grand Prix car race and 19th century casino. The prince is…