mmm, not sure I follow. What would be the point of reversing the order ? `latest_version` should always exist when we are editing an app, right ? And if it doesn't, `current_version` won't work at all.

My idea here was to follow the logic used by features : if we can, always use the `current_version` because it matches what the users are going to see on the listing page. Use `latest_version` as a fallback, because in that case I think it's better and less confusing than displaying nothing at all.

Note that I think displaying version-related stuff mixed with app-related stuff is going to be confusing anyway. Hopefully we'll fix that in https://bugzilla.mozilla.org/show_bug.cgi?id=875048