Use new smarty {edit} plugin to conditionally hide description blocks in view mode

We now have a cleaner way of NOT showing descriptive blocks in forms when we are in "view" mode. Rather than using this syntax:

{if $action neq 4}
<dt> </dt><dd class="description"> {ts}Are users required to complete this field?{/ts}</dd>
{/if}

... we just surround the element/code that we only want to show during create/update with the {edit}{/edit} tags:
{edit}
<dt> </dt><dd class="description"> {ts}Are users required to complete this field?{/ts}</dd>
{/edit}

I've updated the first field in templates/UF/Form/Field.tpl as an example.

Please search for the conditional {if $action neq 4}

in existing templates and update to use the new syntax.

NOTE: We can't use this for if/else situations - so there will still be some places where we need to retain the conditional syntax.