Comment 6 for bug 2975

So there are three ways we could treat someone's suggestion where they've already made a suggestion for that string.
1: Assume they're offering an alternative. If they're correcting their mistake, the old suggestion is something the reviewer can deal with.
2: Assume they're correcting their mistake. If they want to offer an alternative, fix bug 25 so they can discuss it outside the translation field itself.
3: Assume neither, and offer radio buttons or similar for whether they're offering an alternative or a correction.