lergo-237 : default of new lesson or question created is the site
language
lergo-232 : If a lesson's language isn't defined then site language
remains unchanged.

Improvments for using keyboard while answering quiz. 
cursor will default come to text box 
enter can be use to submitt or move next
Merge pull request #101 from lergo/lergo-237

lergo-237 : default of new lesson or question created is the site