This way we can simplify the way we generate form fields. In some cases,
we also use the human attribute in table headers, which IMHO makes
sense.
I haven't moved all of them: for example, sometimes a label is
different depending on whether it's shown to administrators, valuators,
or users. And I haven't touched the ones related to devise, since I
wasn't sure about possible side effects.
Note I've also removed placeholders when they had the same text as their
labels, since they weren't helpful. On the contrary, the added redundant
text to the form, potentially distracting users.
When we grouped the fields together, the last one turned into a
`last-child`, which foundation automatically aligns to the right.
The markdown editor also needed to be tweaked a little bit.
If we enabled the locale and then added an option, the "add option" link
added the partial which was generated before enabling the translation,
and so it generated a field where the translation was disabled.
Enabling the translation after inserting each field solves the issue.
