Update en.md

Changed "appFiles" to "jsList" in the project.json description
Update en.md

Fixes a typo "PlayScnee.js" to "PlayScene.js"
Update en.md
Updates en.md

Fixes "jumps up and jumps up" to "jumps up or jumps down"
Merge pull request #332 from MicheleV/master

Fix few typos inside the html5 parkour game tutorial (javascript-v3.0)