{contact.first_name|bool}

We can find and replace these across all message templates (after checking for other cases besides first_name). However, how will this work with the copies of these emails that live on Email's side. @RLopez-WMF do you have thoughts on this? It is likely to be a lot of message templates that need updating.

For the future, we should use {if {contact.first_name|bool}} instead of {if '{contact.first_name}'} and the same for any other conditionals for strings existing.