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Created attachment 7180 [details]
Change showCustomIntro() to allow for localization of custom editintro messages

Custom editintro messages can be implemented by passing an additional parameter in the URL, "editintro=".  Currently the value passed is the name of an article page on the wiki.

This does not allow for the localization of custom editintro messages without changing the url parameters for each and every language, an arduous task if you're building a custom editintro message into an extension.

The editintro functionality, which is contained in EditPage::showCustomIntro() can be easily modified to allow for an easier implementation of a localized custom editintro message.  Then, such messages can be passed in an extension's .i18n. file and will be displayed based on the user's selected language.

A proposed solution would be to make the following change to EditPage::showCustomIntro() (patch is attached with this change)

	/**
	 * Attempt to show a custom editing introduction, if supplied
	 *
	 * Custom editing instructions can either be a message in the MediaWiki namespace, or an article page on the wiki
	 * This function tests first to see if a message exists with the key passed as the "editintro" url parameter and
	 * returns that message; if not, then it checks to see if an article exists on the wiki and returns the article contents
	 * If neither exist, then returns false.
	 *
	 * @return bool
	 */
	protected function showCustomIntro() {
		global $wgOut;
		if ( $this->editintro ) {
			# checks to see if there is an existing message in the message cache; if so, returns it.
			if( !wfEmptyMsg( wfMsg($this->editintro), $this->editintro ) ) {
				$wgOut->wrapWikiMsg( '<div class="mw-newarticlecustomtext">$1</div>', $this->editintro );
				return true;
			}
			$title = Title::newFromText( $this->editintro );
			if ( $title instanceof Title && $title->exists() && $title->userCanRead() ) {
				$revision = Revision::newFromTitle( $title );
				$wgOut->addWikiTextTitleTidy( $revision->getText(), $this->mTitle );
				return true;
			}
		} else {
			return false;
		}
	}