Edit user_mailman_register.module. Change the "%time" placeholder to "@time",...

rclemingsrequested to merge
issue/user_mailman_register-3513578:3513578-clean-up-date into 7.x-3.x

Edit user_mailman_register.module. Change the "%time" placeholder to "@time", add the default "long" format to the date.formatter service call, and remove the unused "%name" placeholder.

Closes #3513578

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