resolving conflicts from merging in Brian's feature branch
Rename function is_completed to is_submitted, to agree with master
Add unit tests to cover new Python lines
Lettuce acceptance tests for behavior expected from submitting correct and incorrect answers
Parametrize Lettuce tests, cover (in)correct, blank, and reset cases
Write Jasmine tests
Improve styling of visual display
Fix code standard violations
Partial i18n of display strings
Fix whitespace violation