Add shownotes button to media player

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>

Show the file name in the shownotes

Fix whitespace

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>

Fix whitespace changes. Remove visible:true not needed. Make sure the button text can be localized

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>

Only show the filename if downloaded, and basename at that

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>

Remove tabs

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>

Make same as main

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>

Make same as main

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>

Make same as main

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>