Adding many blockers of bug 38638 to the list of "easy" bugs, to mark them as candidates for [[mw:Google Code-in]] tasks (gci2013). If you think this bug is not suitable, remove the keyword.

Will mentor this for Google-Code-in-2017.

@Nemo_bis, is this all about adding this message into mediawiki i18n? Or is there more to it, if so, could you add more flesh to the ticket?

@D3r1ck01: The current message in MediaWiki core's includes/actions/InfoAction.php and its parameter $1 uses [[ https://doc.wikimedia.org/mediawiki-core/master/php/classLanguage.html | Language::formatDuration ]]:

		// Recent number of edits (within past 30 days)
		$pageInfo['header-edits'][] = [
			$this->msg( 'pageinfo-recent-edits',
				$lang->formatDuration( $config->get( 'RCMaxAge' ) ) ),
			$lang->formatNum( $pageCounts['recent_edits'] )
		];

Its English translation is defined in ./languages/i18n/en.json as "pageinfo-recent-edits": "Recent number of edits (within past $1)",.
On https://translatewiki.net/wiki/MediaWiki:Pageinfo-recent-edits/en people can translate that message to other languages.

It looks like the fix is to split this into separate messages, because "within past $1" is not a nominative case.

But it's unclear to me how/what's the best way to fix this. So I am tempted to remove good first task until we know.

Removing good first task and Google-Code-in-2017 as per last comment. Please feel free to re-add once the path ahead for a contributor is clear.