Both desktop and new mobile termbox shouldn't show non-supported languages in either the current or historic revisions.
- Remove from desktop termbox
- remove from title and content of PageOutput
- remove from ParserOutput (patches up for review)
- remove from post load JS generated "Additional Languages"
- Remove from mobile termbox
- ensure unusual interface language don't show empty row
- ensure previously valid terms aren't displayed in secondary languages ("in more languages" section)
- ensure previously valid terms aren't displayed in additional languages