Adds a "persist" option for modal forms

InvenTree/part/templates/part/category.html

@@ -313,6 +313,10 @@
             fields: fields,
             groups: partGroups(),
             title: '{% trans "Create Part" %}',
+            reloadFormAfterSuccess: true,
+            persist: true,
+            persistMessage: '{% trans "Create another part after this one" %}',
+            successMessage: '{% trans "Part created successfully" %}',
             onSuccess: function(data) {
                 // Follow the new part
                 location.href = `/part/${data.pk}/`;