Compensation control

* removes CompensationControl model
* adds comment field to CompensationAction
* adds max length of 200 for comment fields in forms
* adds rendering of error messages in case of invalid form input
* adds/updates translations

konova/forms.py

@@ -162,10 +162,17 @@ class BaseModalForm(BaseForm, BSModalForm):
                 )
                 return redirect(redirect_url)
             else:
-                messages.info(
+                messages.error(
                     request,
-                    msg_error
+                    msg_error,
+                    extra_tags="danger"
                 )
+                for field, error in self.errors.items():
+                    messages.error(
+                        request,
+                        "{}: {}".format(self.fields[field].label, _(error[0])),
+                        extra_tags="danger"
+                    )
                 return redirect(redirect_url)
         elif request.method == "GET":
             context = {
@@ -275,9 +282,10 @@ class NewDocumentForm(BaseModalForm):
     )
     comment = forms.CharField(
         required=False,
+        max_length=200,
         label=_("Comment"),
         label_suffix=_(""),
-        help_text=_("Additional comment on this file"),
+        help_text=_("Additional comment, maximum {} letters").format(200),
         widget=forms.Textarea(
             attrs={
                 "cols": 30,