Allow html in labels

This is useful, for instance, if you want to put dynamic content
into a label. If we had some sort of eco benefits page you might
want a label like:

```
<span class="currency">$</span> per kWh
```

Then in js one could do:

```
$('.currency').html(new_curreny_value);
```
Allow updating benefit values
Support serializing lazy translated fields
Merge pull request #633 from ahinz/topic/inline-form-fixes

Topic/inline form fixes