[Confluence] move buttons to the right side, improve navigation

make navigation in several dialogs more natural by moving the buttons to the right-hand side.

as discussed in: http://forum.xbmc.org/showthread.php?tid=153416

screenshots:
http://i687.photobucket.com/albums/vv237/roniez/workz/browser.jpg
http://i687.photobucket.com/albums/vv237/roniez/workz/select.jpg
http://i687.photobucket.com/albums/vv237/roniez/workz/channel.jpg
http://i687.photobucket.com/albums/vv237/roniez/workz/group.jpg