{{msg-mantis|S reminder sent to|notext=yes}}

 Done

The original message doesn't seem to have been changed (no parameter appears). Is it a $1 after the colon?

The original message has changed. The hard coded colon in the code has moved to the message. No parameter with a comma separated list of usernames was added, if *that* is what you expected.

Ohhhhhh, I see :-) Got it. Thanks.