lergo-277 : in open question, if an explanation is defined to show it to
user regardless of his answer
lergo-275 : lesson invite - clicking "enter" after entering student name
will be like clicking on "submit"
lergo-294 : The font used for fields "lesson title" and "lesson
description" is not the right one
lergo-300 :Add 1-2 lines spaces above and below audio button in play
quiz and preview question
Merge pull request #122 from lergo/lergo-277

lergo-277 : in open question, if an explanation is defined to show it to