Backport workflow context and field support

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/document_states/forms.py

@@ -165,26 +165,19 @@ WorkflowTransitionTriggerEventRelationshipFormSet = formset_factory(
 )
 
 
-class WorkflowInstanceTransitionForm(forms.Form):
+class WorkflowInstanceTransitionSelectForm(forms.Form):
     def __init__(self, *args, **kwargs):
         user = kwargs.pop('user')
         workflow_instance = kwargs.pop('workflow_instance')
-        super(WorkflowInstanceTransitionForm, self).__init__(*args, **kwargs)
+        super(WorkflowInstanceTransitionSelectForm, self).__init__(*args, **kwargs)
         self.fields[
             'transition'
         ].queryset = workflow_instance.get_transition_choices(_user=user)
 
     transition = forms.ModelChoiceField(
+        help_text=_('Select a transition to execute in the next step.'),
         label=_('Transition'), queryset=WorkflowTransition.objects.none()
     )
-    comment = forms.CharField(
-        help_text=_('Optional comment to attach to the transition.'),
-        label=_('Comment'), required=False, widget=forms.widgets.Textarea(
-            attrs={
-                'rows': 3
-            }
-        )
-    )
 
 
 class WorkflowPreviewForm(forms.Form):