Thinking about the easiest way of adding a useful scale to every course on moodle.org, how about if I add a 2-item scale to every course, using google translate to translate the word 'Useful' into the appropriate language. The not-needed scale items can then be deleted in the database.
I can then announce to course facilitators that we have set up a useful scale in every course which they can enable for forums in their courses, and to let me know if I have got the translation of 'Useful' wrong for their language. (I'm hoping for a high success rate from good old google translate, and thinking it will be easier to fix a few wrong translations than wait for every course facilitator to respond to a request to translate a single word.)
Also do we really need a description for the 'Useful' scale, as used in the awfully broken rating help popup (see MDL-36387), or can we just remove that help popup on moodle.org? (I'm thinking that rating a post as useful is similar to voting for a tracker issue or liking something on facebook i.e. so obvious that a help popup is not necessary.)