delete unused code
delete unused image button
rework buildButton to add class
pass score gauge / NB_LVL_END for user comprehension
add security checks for uncompatible browser (ie essentially)
cache compatibilities instead recalcul everytime
add description in compatibility view (only an item isn't compatible)
add indicator compatibility in firstPage button
remove ajax call from obligatory compatibility
re-push wav on top because chrome(ium) don't loop with ogg