Do not use the @translate on the FormDecorator

You must not decorate decorator with @translate(). Only final classes have to
be decorated.

for the same reason, the order of decorator declaration in final classes is
important and @translate must be in last position (juste before the class
declaration)

source/components/conversation/FormDecorator.js

@@ -32,7 +32,6 @@ export var FormDecorator = formType => RenderField =>
 				dispatch(change('conversation', field, value))
 		})
 	)
-	@translate()
 	class extends Component {
 		static contextTypes = {
 			i18n: PropTypes.object.isRequired