The `type: :feature` is automatically detected by RSpec because these
tests are inside the `spec/features` folder. Using `feature` re-adds a
`type: :feature` to these files, which will result in a conflict when we
upgrade to Rails 5.1's system tests.
Because of this change, we also need to change `background` to `before`
or else these tests will fail.
We needed to bring back support for CKEditor in our translatable form,
which we had temporarily remove.
And now we support CKEditor in our translatable specs, and so we can
remove the duplicated specs for poll question answers.
