Most of the changes date back to #10700 
We were trying to trace down a problematic change likely when merging 2.2.31 into 2.3 ( #11033 )
If anyone spots issues with bbb-conf on their 2.3 server, please comment

settings.yml media configs incorrectly placed under "stats"

Pulled HTML5 locales on 2.3, Dec 18, 2020

Handle ejected presenter case, add missing videoDock locales

Update URL to HTTPS

Change http:// to https://

Merge 2.2.31 into 2.3

secure http in application.conf

Change bigbluebutton.properties client url param to defaultHTML5ClientUrl

bbb-web to loadbalance bbb-html5 instances

Add option to generate heap file and tweak metrics

https://github.com/bigbluebutton/bigbluebutton/pull/10826

Fix dangling fi

Provide shorter audio prompts for muted/unmuted

Add keep alive message to audio's websocket 

Prevent calling stopUserTyping when parameters are undefined

Audio client logs already cover audio session progress the way we need.
This avoids keepAlive and other unnecessary messages to be logged in browser's console.
If setting is not present, default value is set to false.

This was added as an option (websocketKeepAliveInterval), which is the interval to send keep alive messages.
Setting websocketKeepAliveInterval to 0 disables the keep alive, producing the same old behavior.
This helps avoid websocket disconnection due to socket inactivity, preventing it to unnecessarily reconnect.
Also, sometimes reconnect fails and error 1005 is triggered.
Fixes problems reported in #10985.
Also reduces occurrences of error 1005.