Save in HTML editor

This is inconsistent with the save/update button in the rest of the back end in that it does not actually save the changes that have been made.

Merely closes the window and leaves the text ready to be saved later.

It should either save the text or maybe add a button (if possible since is an add on) so that it does actually update the data.

(There is also lack of consistency with save - update throughout the back end)