Engineering note: This 'should' be as simple as either a hard-coded dir="ltr" on ext-wikilambda-pagination__page-selector__main or a @noflip annotation in the CSS for css-janus, but I've not dug in.

Change #1014502 had a related patch set uploaded (by Jforrester; author: Jforrester):

[mediawiki/extensions/WikiLambda@master] Pagination component: Don't flip the fraction in RTL environments

https://gerrit.wikimedia.org/r/1014502

If we don't consider that to be a fraction what we could do is to add an optional translation for RTL languages that instead of displaying in RTL

These aren't fractions. A message that says "out of $1" is probably a better solution. And it will be clearer in all languages, not only the RTL ones.

In T342609#9661497, @Amire80 wrote:

If we don't consider that to be a fraction what we could do is to add an optional translation for RTL languages that instead of displaying in RTL

These aren't fractions. A message that says "out of $1" is probably a better solution. And it will be clearer in all languages, not only the RTL ones.

makes sense. we might be able to also address this once we can use the codex table component, which comes with a built-in footer T303320: Table: Add Table component to Codex

Follow-up: I've tried this on the page https://www.wikifunctions.org/wiki/Z13087?uselang=he , and I actually don't think that it's much of an RTL problem to begin with. The current display works well enough in Hebrew. Perhaps you can ask for more opinions from people who use wikis in Arabic, Persian, Punjabi (pnb), etc., but I don't think their opinion will be very different (but I might also be wrong).

I still think that changing it from "/" to words is better for all languages, and not just for RTL, but it's not a very high priority issue.

I think I do see another issue here: the digits are not localized. For example, they should probably appear in Eastern Arabic numerals when you view the page in Persian: https://www.wikifunctions.org/wiki/Z13087?uselang=fa . But that's a general i18n issue and not an RTL issue, and someone who uses Persian wikis should verify that it's actually a problem. If it is, it should be reported as a separate task.