Fantastic feature on the BBC News Welsh site.
I stumbled upon this just now. If you visit the BBC's Welsh news service, there's a button at the top right of the page labelled 'Vocab'.
Click it, and once it's done its job you can click on any of the words on the page for an instant translation and definition. It's essentially a better version of Readlang specifically tailored for Welsh learners.
Could also try http://golwg360.cymru/, for Welsh news, with a similar Vocab button on the top as well.
Oh my goodness, that is brilliant! Thank you so much for sharing!!! I've occasionally taken a look at the news in Welsh, this actually makes it a good learning experience for a beginner! Diolch!