Label list: Finish JS-Class for form

[ScreamingDev]

Below the order you see multiple created labels
and each of them it handled by a JS-Class.
Unfortunately this JS-Class does not cover all functionality as some button are still handled by simple JS-functions etc.
So we want to rebuild the logic here using a JS-Class so that we can reuse this dialog lots of times without hurt.

---

• needs Label list: Make JS-Template render it #155