User blog comment:DaNASCAT/Technical Update: May 22, 2017/@comment-28083312-20170522202351/@comment-126761-20170523150830

They are mainly improvements to the most commonly used languages (the top 10 or so), such as a wide variety of grammatical and spelling improvements.

In the background we've been working on updating the way we perform translation work on the site - hopefully we'll be able to share more about that in the near future.