Steps to reproduce the issue

Install old extension for Joomla 4
Sample file http://screenshot.myjoom.la/568113a08854
Go to Joomla 4 admin

Expected result

text of "1 Updates are available"
or
Updates are available (1) where the 1 is a bubble in red with text white floated top right maybe

I dont have the eye for how it should be, only that it currently is not the best it can be.

Actual result

Note that the grey badge (1) gets lost and looks strange.

Also the popover alert has text

(1) Extension Update(s) are available:

I suggest that this could be a dynamic string to incorprate the number into the actual sentance to remove the (s) plurarlizer and remove the :

so eg

1 Extension update is available

100 Extension updates are available