0d7a30fa27ebaefb5d89693bbe658916b982c082 introduced message key "tooltip-iwiki".
The term or abbreviation "iwiki" doesn't exist and has no meaning in MediaWiki. To avoid more ambiguity (as if we don't have enough confusing and ambiguous *wiki terms) please rename this to something else before the 1.22.0 release.
Filing a bug instead of a commit because this probably needs a little bit of coordination with translatewiki to assure translation history and attribution is preserved. And that part is harder than the commit, so the commit would naturally follow at that point.