Boss for Sensei 1.0.4

* Compatibility with Sensei 1.9.0+
* Boss theme “Boxed” CSS compatibility fixes
* BadgeOS CSS compatibility fixes
* Invite Anyone plugin, improved compatibility
* Fixed Message completed notice appearing twice on single lesson
* Fixed archives page, sidebar loading at bottom of page
* Fixed broken video in single course page
* Support for Pango Sensei Module Collapse added
* Fixed missing translation strings