Kumascript errors 1044093 dw

Adding properties and toggle functionality to Kumascript error area.
So, you could wrap this in:
```
{% if request.user.has_perm('wiki.change_template_document')) %}
```
like [we do at the model layer](https://github.com/darkwing/kuma/blob/1209fe8d945a489a60d9b6a87e0ce43a35bf7050/kuma/wiki/models.py#L1364).