release: stable-6726-2

* ae3e7e76 jvb: make MUC_NICKNAME configurable
* 0be9c8fd web: allow configuring buttons in toolbar and pre-join screen
* d9d12f09 jvb: fix resolving XMPP server aliases
* 81dc3849 jigasi: allow jigasi guest participants
* a8a596bd jicofo: configure trusted-domains for Jibri if ENABLE_RECORDING is set
* d250ad7f misc: working on latest