There is a plugin here to change Groups on a BPress site to Communities.
I need something similar to change the word Blogs to Sites, as I am using WPMU to make sites (and not blogs!). It looks like a real faff to go and edit all the php. Instead a plugin that allowed you to edit these parameters in the wordpress backend would be fab.
Or similar to the plugin linked above, if you could edit it in the plugin file and upload that would be fine too...