Finish Zeykerokyu

[Willem3141]

Fixes #143.

[Willem3141]

To do:

• [x] Fix si-verbs
• [x] Show corrections
• [x] Style word lists in lessons and in the review finish modal
• [ ] Show review finish modal on clicking the Exit session button

Longer term (after this PR):

• [ ] On making an error, reinsert the item into the queue for later
• [ ] Ask for stress
• [ ] Ask for other attributes (verb transitivity and infix locations)
• [ ] Implement keyboard shortcuts