This is a tracking bug to track the conversion of API modules in extensions to use the new 18n help/documentation that was introduced in 1.25. All of these should be suitable as GCI tasks.
Documentation on how to convert is available at: https://www.mediawiki.org/wiki/API/Architecture_work/i18n
Anomie's patches that converted all WMF-deployed extensions can be used as examples, and are at: https://gerrit.wikimedia.org/r/#/q/I67395aff48185f3e09da31b51a08aa2541fe6a17,n,z
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