Truncated markup can be displayed in forums user profile view

FOR-581
This will not match the full tag if the alt text contains a `>` character. Use jQuery to replace the image elements. Something like the following:

```
$result = $("<div>" + truncated_text + "</div>")
imagesToReplace = $result.find("img:not(:first)")
if imagesToReplace.length > 0
    $result.append("<p><em>Some images in this post have been omitted</em></p>")
imagesToReplace.replaceWith("<em>image omitted</em>")
$result.html()
```