LSNBLDR-295; improve add multimedia dialog


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@131033 66ffb92e-73f9-0310-93c1-f5514f145a0a
LSNBLDR-295; forgot to update label to show possibility of embed code


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@131035 66ffb92e-73f9-0310-93c1-f5514f145a0a
LSNbLDR-295; missing file


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@131036 66ffb92e-73f9-0310-93c1-f5514f145a0a