Payments add modal form

* adds help texts to add payment form
* adds removing button for payments
* refactors user fetching into BaseForm
* adds generic RemoveModalForm which is intended to be used for every modal form which shall remove something
* adds translations
* removes unused html
* prepares payment amount field to be able to process german inputs like '1.000,50' which is not the international default

konova/forms.py

@@ -29,6 +29,7 @@ class BaseForm(forms.Form):
 
     def __init__(self, *args, **kwargs):
         self.instance = kwargs.pop("instance", None)
+        self.user = kwargs.pop("user", None)
         super().__init__(*args, **kwargs)
 
     @abstractmethod
@@ -137,6 +138,34 @@ class SimpleGeomForm(BaseForm):
         self.area = geom.area
 
 
+class RemoveModalForm(BaseModalForm):
+    """ Generic removing modal form
+
+    Can be used for anything, where removing shall be confirmed by the user a second time.
+
+    """
+    confirm = forms.BooleanField(
+        label=_("Confirm"),
+        label_suffix=_(""),
+        widget=forms.CheckboxInput(),
+        required=True,
+    )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.form_title = _("Remove")
+        self.form_caption = _("Are you sure?")
+
+    def save(self):
+        if hasattr(self.instance, "deleted_on"):
+            self.instance.deleted_on = timezone.now()
+            self.instance.deleted_by = self.user
+            self.instance.save()
+        else:
+            # If the class does not provide restorable delete functionality, we must delete the entry finally
+            self.instance.delete()
+
+
 class RemoveDocumentForm(BaseModalForm):
     confirm = forms.BooleanField(
         label=_("Confirm"),