Add api to application
Fix practice page
Change name mode learn
fix style lesson checkpoint wrapper
Change mixin indexOf to core, fix practice nextCheckpoint
thay doi en.js game
edit huong dan
Merge pull request #50 from HuynhThan/feature/Edit_trang_game

thay doi en.js game
Merge pull request #49 from nguyenngochan/feature/edit_visualization_page#3

edit learn admin page
Fix LectureCtrl
edit main.js application
edit lean page, visualization page