With 45093c330fc38256444276ebf7434ee8d8c51b04 the messages for api modules get splitted and new apihelp-*-summary messages were added to the extensions.
With afe9a0fa5bd8fdcc9f2a9403f366e24f46fd64d1 the old code gets hard-deprecated
With a4d976fc833193c3a19c082de77d52b69cf2cb1d the old code was removed.
For the api modules in extensions there are often now two messages, one for the old -description and for the "newly" -summary. The description was kept to support older versions of mediawiki, but that is no longer needed when the required version is > 1.33
Just remove the messages and avoid translation work of unused messages
CodeSearch: https://codesearch.wmcloud.org/search/?q=%5BDd%5Doc-apihelp-description