chore(macros/LearnSidebar): add Japanese translation for Cross browser testing, Git and GitHub, Server-side website programming, First steps, Django web framework (Python), Express Web Framework (Node.js/JavaScript)

chore(macros/LearnSidebar): add Japanese translation for Cross browser testing, Git and GitHub, Server-side website programming, First steps, Django web framework (Python), Express Web Framework (Node.js/JavaScript) #8165