Including a default set of translations with a gem

I’m probably missing something here, but after about an hour of
digging around I couldn’t figure this out, so I figured I’d ask. I’ve
got a gem that I’d like to add I18N support to. The gem has absolutely
no connection to Rails whatsoever, but I’d love it to be set up such
that if a user overrides the translated strings in their Rails
configured locales they would be overridden.

How do I go about including a set of translations within my gem?