Ask HN: Where to find OS translation projects?

My friend is has a masters in translation looking for open source projects to help on. I suggested she looked online, as some of the projects I've been involved in have all needed translation at some point. However now I've come to look for a project for her I can't find one. When I used to look at localisation files there were just a set of structured text files. I guess there have now been dedicated toolkits developed to help crowdsource this kind of work. Any advice/pointers would be gratefully received.