This makes the Thank button function correctly for posts that are
dynamically loaded with JavaScript (from
http://stackoverflow.com/q/9344306)
Bug: 63205
Change-Id: If51e1801e633573c8f0814832e26d643e1237d53
ThankedLabel is inserted before the Thank link that's being clicked.
The label needs to be cloned on each insertion so it is not removed
on subsequent $.insert().
Bug: 63506
Change-Id: I8327158880cba9a141a4d9977414022173c4c8ac