The only thing I would add is the ability to “select all supported languages” in the drop down list because right now you have to add each language one at a time. Not a big deal, but it would be a good time saver for those that have a lot of experience or places to work on. 
Add to this, the ability to turn on the “auto translation” sub-settings all at once. Right now each language has to be done one at a time. Customizing each one, I understand. I figure though most of us are going to want to enable this in mass, all at once. 