I updated MMM-birthdays to add the ability to turn off the module when there are no bdays to show.
Also added the ability to update the name of the title/header
Pull request here: https://github.com/amitchone/MMM-birthdays/pull/10
My fork, if you want to install and test it.
https://github.com/jbat66/MMM-birthdays
Thank you Adam for writing this module.