James Forrester, 03/06/2014 18:41:
Indeed. This is the outcome​ of several iterations of the messaging around the edit summary box to see what the effect was. It's not by accident that it differs from the label used for wikitext.
Rationale is not documented hence translators will not know how to reflect the features you're after in their translations. https://translatewiki.net/wiki/MediaWiki:Visualeditor-editsummary/qqq
MobileFrontend is not in sync either: https://translatewiki.net/wiki/MediaWiki:Mobile-frontend-editor-summary-plac...
Potentially we should consider making the same improvements for the wikitext editor, but we've not considered doing that yet.
Would be trivial if the edit summary had a placeholder like the search bar.
Nemo