add test, still need to be finished later
add test and use ScreenLayout to detect which img to be used
change from _mobile to _small to make it consistent
add ftu wordings for small device
remove ftu wordings, check the followup bug 902487
add tutorial_steps
fix styles with right selector
update tutorial with layout detect
tiny device works well now, time to fight with flatfish
add 6 images
update wordings
move that's it wording back to welcome
fix steps count
change file names to large
update to large
it is weird in this change, can't turn on
fix numbers of steps back
fallback to let tiny devices workable ( have to check ui.js and dom )
mobile and tablet works well now, yeah
just tuned tablet and it looks nice