This is entirely grammatically correct, though awkward.

Maybe switching them around would help:
"There are 1,180 pages in this category (200 shown below)."
"There are 10 pages in this category."

"There are 1,180 pages in this category (200 shown below)."

"Pages 1-200 of 1,180 in this category:"

"There are 10 pages in this category."

"There are 10 pages in this category:"

ayg wrote:

I don't like the parenthesized or colon-ized versions. "There are 10 pages in this category" omits the fact that they consist of the list following -- which may not be obvious, you can't expect the user to count that there are exactly 198 categories in the list or whatever. The point was to clearly indicate 1) the number of categories listed, and 2) the total number of categories.

One possibility is that (1) could just be dropped: "There are 1,180 pages in this category", no indication of how many are on the current page. I listed the number that were on the current page because that's what the old pre-category-table listing said, but I don't know if that's useful info? There are other places we could put it, too, like in the headings or who knows where.

Component: Categories -> i18n
Summary: "The following 200 pages are in this category" -> "Wording of messages in category sections"
So we are talking about the set of messages below. If something needs to be changed, we might as well change them all. Bring it on and take your time. ;)

'category-subcat-count' => '{{PLURAL:$2|This category has only the following subcategory.|This category has the following {{PLURAL:$1|subcategory|$1 subcategories}}, out of $2 total.}}',
'category-subcat-count-limited' => 'This category has the following {{PLURAL:$1|subcategory|$1 subcategories}}.',
'category-article-count' => '{{PLURAL:$2|This category contains only the following page.|The following {{PLURAL:$1|page is|$1 pages are}} in this category, out of $2 total.}}',
'category-article-count-limited' => 'The following {{PLURAL:$1|page is|$1 pages are}} in the current category.',
'category-file-count' => '{{PLURAL:$2|This category contains only the following file.|The following {{PLURAL:$1|file is|$1 files are}} in this category, out of $2 total.}}',
'category-file-count-limited' => 'The following {{PLURAL:$1|file is|$1 files are}} in the current category.',

Closed as WONTFIX per comment 1. IMO there's not much to be fixed, and no feedback.