Comment 13 for bug 1278790

@pat-mcgowan I had seen some examples that had the counter bottom right, such as material design. In addition, we want the placement to fit in with our other patterns, which currently we do not use centre alignment. Another benefit of having the counter to the right is it's near the send button, so the user can more clearly keep track of their messages. As for x-small to small, that's fine.