add keynote speaker
merge master with develop
Merge branch 'develop'
add speaker urda yen
Merge branch 'develop'

Conflicts:
	app/partials/schedule.jade
add registration url
add media contact
change title to h4
add language tags and interpretation info
fix language header link
heading tweaks
Merge branch 'develop'
and po workflow
Merge branch 'develop'
Merge remote-tracking branch 'origin/master'
fix header height
alt and title
require gettext-parser
use lang for 404
en page cleanup