A small linkflair & template fix.

Selecting a linkflair with editable text doesn't show a 'live preview' as the flair JS only does this for user flair.

The flairlistrow template (can be seen in: flair settings > grant flair) has an issue with error fields, they are being given bad class names:

    <span class="error ('BAD_CSS_NAME', 'flair_css_class') field-name" style="display:none"></span>
    <span class="error ('TOO_MUCH_FLAIR_CSS', 'flair_css_class') field-name" style="display:none"></span>

I've fixed this as per: http://github.com/reddit/reddit/tree/master/r2/r2/templates/flairtemplateeditor.html#L55, and also tested on a local VM.