Updated mediawiki/extensions
Project: mediawiki/extensions/EmailCapture  1867e42feb629d95f4d474fab54acae4028dfb60

Use plain ' instead of curved one for consistency

Spotted by Shirayuki in
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Emailcapture-response-body/en_%282%29

Change-Id: If53a4a1eca02a8675617cad38039262f6ba80dcc