Updated: Comment #1
The content translation settings UI is a really complex and, most of all, dynamic UI. Enabling a checkbox, for instance, can make a new table in a different place show up (e.g. enabling translation for a certain entity type) or simply make other table rows show up (e.g. enabling translation for a certain entity bundle make its field translation settings show up in the same table).. Vice-versa, disabling checkboxes make the same elements hidden to the user.
User interface changes
Yes. Screenreader interface changes to announce parts that are live, when they change.