"changes" string is now pluralized, fixes "current version is 1 days old"

A really minor change. I've never actually requested a pull or even written for android, so be warned, I've not tested this bit of code. Given this page though, it looks like the proper way of doing it:

http://developer.android.com/guide/topics/resources/string-resource.html

There are some other things I'd like to do, but i'll have to do some more learning with java in order to do it myself. For now i'll just create a ticket for that stuff.