Add missing written articles to LearnSidebar (Client-side Web APIs) (#347)
Add missing written articles to LearnSidebar (Client-side Web APIs) (#347)

* Add missing written articles to LearnSidebar (Client-side Web APIs)

* Fix extraneous _ in english strings

a2sheppy/kumascript,jpmedley/kumascript,jpmedley/kumascript,a2sheppy/kumascript