NOTE: Completed in T229813: Mark all JavaScript strings for translation
Mark js strings for translation. The text for the initial button state is also served in the HTML, but the translatable string is merged so we still only translate once even though it is used in HTML and JS
Todo: Probably cleaner to remove from HTML completely to avoid confusion for future developers
Note: The string translation part of this is covered in this task T229813: Mark all JavaScript strings for translation