[validation api] properly use yams 0.36 validation error api and update message catalog. Follows bbe0d6985e59
the creation of the `translate` method in the 23a10f049447 yams commit.
action box
Area visible in the upper left column. You have a list of available actions on the entity. The most frequently used entry is `modify`.
object
All element created in the application
Example: project, ticket, user, ...
relation editing module
HTML widget that let you define new relations amongst objects.
relation
It's a kind of 'smart' link between 2 objets of the application. It has a specific sense that determine dynamic behaviour and add a new logic of the content.