hinneLinks

Bug2: Mainly it seems, that my (default) font is the problem, as it allows two characters to merge into each other (the arrow seems to be inside of the 2)....

Yes, its gnome terminal 3.28.2. Zlago does Work, see Screenshot (the vertical crazy signs only appear after a focus change).  Its the Default-Font, Ubuntu Mono Regular i assume, that...

Not sure whats wrong with this, but it looks like your gnome-terminal. Using a different font dosn't change the location of the gibberish like konsole does. 

Workaround (Ubuntu 18.04): Add your self-signed Cert to the System's Certstore: 1. Get the Certificate as a .crt (Or PEM and Rename it). I [tried](https://stackoverflow.com/questions/54576731/get-certificate-of-xmpp-s2s-gateway) to download it myself, but...

There is an (I belive unsupported) option for multiple Instances: activate the Flag "single-instance" as described [here](https://github.com/camunda/camunda-modeler/tree/master/docs/flags).