Use consistent wording for being online / connected to the server and offline / disconnected from the server
The following discussion from !645 (merged) should be addressed:
return tr("%1 is online").arg(displayName);
I'd rather like to use "online", because it's simpler / sounds more modern and it's how everyone else does it. We can rename the "online devices" list to "connected devices", so that's not confusing anyone.
We should discuss which words to use for those terms.