While cherry-picking some of this work I noticed those extras.

Changes to the current (v2.2) default configuration of the guest feature.

The ideal is to keep the simplified guest feature as default (`authenticatedGuests=false`)
but we also need to be in sync with Greenlight settings to make this happen.

Greenlight will have to re-add the `guest=true` param on user's join API call when ASK_MODERATOR
is set as guest's policy.

User's name labels can be enabled and disabled at `settings.yml`.

When authenticated guest is disabled (bigbluebutton-web's `authenticatedGuest` property)

Improves the end meeting confirmation message

Presenter selecting a random viewer

adds missing custom parameters specs to the custom parameters test suite

Fixes crash when presenter is kicked

Fixes closed captions language list

Fix fetch loop when override / fallback locales set with region

Fix the issue with connectionStatus resulting in no users being availble to randomly pick from (select random viewer feature)

Rename GoupChatMsg.scala to GroupChatMsg.scala

Remove mountModal requirement in presentation uploader

Temporarily allow undefined user name for offline chat sender

Remove duplicated html id video-modal-input

Correct path to silence.mp3