A tracking task for issues with user rights change notifications.
All relevant messages are currently at:
https://phabricator.wikimedia.org/diffusion/ECHO/browse/master/i18n/en.json;9e342b78382cb42448b72c1435e973ac4800e2a8$171,172,173,174,175,198
Specifically:
> "notification-header-user-rights-add-only": "{{GENDER:$4|Your}} user rights were {{GENDER:$1|changed}}. You have been added to: $2.",
> "notification-header-user-rights-remove-only": "{{GENDER:$4|Your}} user rights were {{GENDER:$1|changed}}. You are no longer a member of: $2.",
> "notification-header-user-rights-add-and-remove": "{{GENDER:$6|Your}} user rights were {{GENDER:$1|changed}}. You have been added to: $2. You are no longer a member of: $4.",
> "notification-header-user-rights-expiry-change": "The expiry of {{GENDER:$4|your}} membership in the following {{PLURAL:$3|group|groups}} has been {{GENDER:$1|changed}}: $2.",
> "notification-body-user-rights": "$1",
> "notification-user-rights-email-subject": "Your user rights have changed on {{SITENAME}}",