workflows: task result templates

Adds templated task results for use in Holding Pen.

Before:
![Image]
(https://www.dropbox.com/s/0sryglpxpesfnh9/Selection_002.png?dl=1)
After:
![Image]
(https://www.dropbox.com/s/pfgo4fl8kltgv78/Selection_001.png?dl=1)

Also adds better documentation and other fixes.
```jinja2
{{ _('Click on %(x_opening_tag)sAccept%(x_closing_tag)s to allow the record to continue.',
     x_opening_tag='<strong>', ...) }}
```