Modal forms

* adds new POST functionality in NewStateModalForm, which does not use the super classes process_request() method
* adds explaining comments on the is_ajax() call
* updates translations

konova/forms.py

@@ -173,6 +173,10 @@ class BaseModalForm(BaseForm, BSModalForm):
         if request.method == "POST":
             if self.is_valid():
                 if not is_ajax(request.META):
+                    # Modal forms send one POST for checking on data validity. This can be used to return possible errors
+                    # on the form. A second POST (if no errors occured) is sent afterwards and needs to process the
+                    # saving/commiting of the data to the database. is_ajax() performs this check. The first request is
+                    # an ajax call, the second is a regular form POST.
                     self.save()
                     messages.success(
                         request,