This refactors and fixes unicode issues where entities don't display
properly due to being a special character that seems to be rendered
incorrectly in a non-deterministic way every time.
This either removes aria-hidden=true assignments from buttons with
text, or adds a span to only hide the 'x' symbol rather than the
button for closing buttons.
* Change the classes and ids of different widgets and modals
and make suitable changes in `admin.js`.
* Remove any other occurrences of `alias` or `realm_alias`
from admin.js.
Brock Whittaker
Vaida Plankyte
Aditya Bansal
Harshit Bansal
Tim Abbott
Umair Khan