fix(chat): change disconnenct message if connection is lost

Tim Raphael Spamerrequested to merge
t.spamer/web-app:fix/call-in-disconnect-message into main

fix(chat): change disconnenct message if connection is lost

If a connection is interrupted due to network issues, a user closes his tab, or a call-in user hangs up, we send a participant disconnected message with the reason being connection_lost.

This commit changes the chat message displayed in that case from ... was removed from the meeting at ... to ... left the call at ....

Closes #3448 (closed)

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