Trouble using Tap i18n '_' helper function

Hey, guys! I’ve been trying to use tap: i18n and tap:i18n-db with my project. It sounds awesome! The documentation for tap:i18n says there’s a helper function that is triggered with a underscore, like {{_ “hello”}} but everytime I try to use it, I get “Uncaught Error: No such function: _”.

I tried setting it up several ways, but maybe I didn’t understand the documentation.
Does the helper function exist? And if yes, how does one go about setting it up?

Did you ever get this working?