Translate extension does not allow translation admins to move translatable pages with more than 500 subpages, because that proved to be unreliable. Such action needs to be done by a sysadmin. For the purpose of requesting such an action, Wikimedia Phabricator has a form. Meta-Wiki's local version of pt-movepage-page-count-limit links to that Phabricator form, but this doesn't happen on all Wikimedia sites. Consequently, when a translation admin on any other wiki but Meta-Wiki runs into the issue, they're left with figuring out the right format of the request themselves. For an example, compare https://meta.wikimedia.org/wiki/MediaWiki:Pt-movepage-page-count-limit vs https://foundation.wikimedia.org/wiki/MediaWiki:Pt-movepage-page-count-limit.

To resolve this problem, I suggest overriding pt-movepage-page-count-limit within WikimediaMessages, linking to https://phabricator.wikimedia.org/maniphest/task/edit/form/115/, similar to how Meta-Wiki already does this.