We used html_submit_button to pass text to be present in the modal
submit button. There are only two possible options as of now -
"Confirm" and "Save changes" and the correct one can be determined
using is_confirm_modal parameter. So, we remove this paramter for
now and we can add it later if we have more type of modals using
this widget.
This commit renames the html_yes_button parameter of confirm
dialog widget to html_submit_button and also all the related
variables in confirm_dialog.js.
This will help in keeping a general name when deduplicating
the code for confirm_dialog and edit_fields_modal.
The dialog now shows `stream > topic` instead of
just the topic.
This creates a new tiny widget for this purpose,
which can be reused in other places too.
The `undefined` case is probably very unlikely, but
if the `stream_id` is bad, after the user confirms,
the request will fail on the backend, which could
confuse the user, since there will be no changes to
the starred messages in view.
So, we don't open the confirmation dialog at all in
such cases.
Long labels like "Unstar messages" can be confusing for
translators and it can also create bad strings that can
end with like 4 long words in German. It is better to
have the simple options like "Confirm" and "Cancel".
This commit fixes this issue by changing such text
to "Confirm" as default in confirm_dialog_modal.
Part of #17926.