Last modified: 2014-07-07 23:46:35 UTC
There is a message [[MediaWiki:Anontalkpagetext]] which displays at the bottom of the talk page for IP users, as long as it exists. This message is used on enwiki and Meta, at least, to give links useful for people investigating the IP. However, on redlinked IP talk pages, [[MediaWiki:Newarticletext]] is displayed (at least in the most usual case where someone's clicked on a redlink to that IP talk page). It would be useful if it were possible to get the same links on such pages, but at present it's impossible for coding in the interface message to tell an IP's talk page from a registered user's talk page (although enwiki currently uses a heuristic involving #expr that often works in its anontalkpagetext). So this is a request for a new message, such as [[MediaWiki:Newanontalkpagetext]], which displays on the editing screen for anon's talk pages after clicking on a redlink (probably displaying it in addition to newarticletext would cause the least breaking of current messages).
*** Bug 9397 has been marked as a duplicate of this bug. ***
The message in core is: "newarticletext": "You have followed a link to a page that does not exist yet.\nTo create the page, start typing in the box below (see the [$1 help page] for more info).\nIf you are here by mistake, click your browser's <strong>back</strong> button.", I don't really see a need to split it from a i18n perspective. As for configuration, in 1.14 https://www.mediawiki.org/wiki/Help:Edit_notice was added; we have MediaWiki:Editnotice-3 which *almost* does this (I suppose one can't have wildcards there)