The idea of this feature is to suppress the translated version of the page in order languages in the category tree and show only the default page (upon creation). This option is not available by default but can be enabled using the notranslations option in the category tree.
Also, note that if notranslations option is added with the showcount option available, the number of suppressed pages should influence the value of the count. So for example, if we had a page with 20 translated pages (meaning 21 pages in the category), the output should be (TestCat (1 P)), instead of (TestCat (21 P)).
Maybe other ideas of better names?
Having a page with so many translated pages in a category tree will make the list so long and in addition, the main page already has links to the translated versions maybe at the top or at the bottom with <languages/> tag (?). So, it would be good to have an option to suppress the translations and have just the main/default pages in the category tree.