move the css builder to JlmHtmlEditorKit so that other components can see it (yeah, that's otherwise disgusting)
use our best CSS builder for the 'About this world' dialog box
have 'About this box' react correctly programming language changes
use IllegalArgumentException, not InvalidParameterException
world doc is now python friendly (plus cosmetics and standardization)
retranslate everything back to 100%
link++
LessonChooser: give the focus to the go button