Rename "blog post" to "News"

One thing I've found myself doing repeatedly over the last day or so of consulting is (rather embarrassedly) trying to explain what a blog is, and have been twice asked if that can be changed.

In the long run, it's probably much easier to start calling blog posts 'news', at least in the interface. News is easier to explain to someone who is coming to the topic cold: "When something happens, create a news item about it", "Subscribe to the news in a space", etc.