Reference a message key, defined in your messages module corresponding to the current locale.

{{format-message (intl-get 'messages.product.info')
    product='Apple watch'
    price=200
    deadline=yesterday}}
    
{{format-message (intl-get computedProperty)
    product='Apple watch'
    price=200
    deadline=yesterday}}

Passing a static message or a message via a data-binding also works.

{{format-message messages.photos
    name='Jason'
    numPhotos=num
    takenDate=yesterday}}
    
Use within bind-attr

<button {{bind-attr title=(format-message (intl-get 'messages.product.title'))}}>
    Hover to see title
</button>