Migrate editors
- multi-layer modals?
- ui layouts
(from redmine: issue id 1219, created on 2018-11-05tgradl, closed on 2019-01-08)
- Relations:
- child #1224
- child #1225
- child #1226
- child #1234
- parent #1215
(from redmine: issue id 1219, created on 2018-11-05tgradl, closed on 2019-01-08)