Bring back 'Enter' key function when inserting links etc.

[KVentz]

In IP.Board 2 we had the standard JS dialog windows when trying to insert link, email link or image. There were some limitations and issues with that and in IP.Board 3 the dialog windows were replaced. But JS dialog windows has one very useful function: we could enter some text (usually from clipboard using cmd+V/ctrl+V) in it and press 'Enter' key to place the link. But now the 'Enter' key does not function: we must use a mouse cursor to click on a Insert Link/Insert Image button (at least in Safari). Please, return this function and let us using keyboard!