I don't believe there is another way to do this at this point in time. If someone was to develop a plugin for this I would recommend having an emailing template system instead so that you could accomplish this and much more. I have no problem editing my language file - but the only problem is going to be if you upgrade that you make sure you make the changes to the next version that comes out too. I am still yet to put in the effort to understand the plugin system yet, however I have added this onto my 'wish list' for my plugins when I do start writing them. I will make sure I come back and update this question if I get it done.