Unofficial Language Squad keyboard navigation

Choices gets bound to numbers (1-10 [0=10]) on your keyboard, then qwerty layout (q=11, w=12, etc.). Also allow to press enter to Start or Go to next level. License notes for single Chrome Web Store resource : Icon from "Entypo+ Icon Set", source : https://iconduck.com/icons/26792/keyboard , license https://creativecommons.org/licenses/by/4.0/