Show that the Echo notification messages support {{GENDER:$1}}

https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Notification-osm-instance-reboot-completed/en
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Notification-osm-instance-deleted/en
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Notification-osm-instance-build-completed/en

Change-Id: Ifee3dfb22b0377f8e3fdfccdd5fd81fa8ed54e8f