feat(nc-gui): add showNullInCells & showNullAndEmptyInFilter

packages/nc-gui/lang/en.json

@@ -630,6 +630,8 @@
       "deleteViewConfirmation": "Are you sure you want to delete this view?",
       "deleteTableConfirmation": "Do you want to delete the table",
       "showM2mTables": "Show M2M Tables",
+      "showNullInCells": "Show NULL in Cells",
+      "showNullAndEmptyInFilter": "Show NULL and EMPTY in Filter",
       "deleteKanbanStackConfirmation": "Deleting this stack will also remove the select option `{stackToBeDeleted}` from the `{groupingField}`. The records will move to the uncategorized stack.",
       "computedFieldEditWarning": "Computed field: contents are read-only. Use column edit menu to reconfigure",
       "computedFieldDeleteWarning": "Computed field: contents are read-only. Unable to clear content.",