List reason for role change in MUC

Shows the reason for the role change in the status message. This is
mostly relevant for communicating the reason and possibly duration for a
moderator or bot muting a user.

Refs: #5679
Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>

binaries/data/mods/public/gui/lobby/LobbyPage/Chat/StatusMessages/StatusMessageEvents.js

@@ -94,6 +94,9 @@ ChatMessageEvents.Role = class
 			txt = sprintf(roleType.nick, this.args);
 		}
 
+		if (message.reason)
+			txt = sprintf(translate("%(rolechangemessage)s Reason: %(reason)s"), { "rolechangemessage": txt, "reason": message.reason });
+
 		this.chatMessagesPanel.addText(
 			message.time,
 			this.statusMessageFormat.format(txt));

source/lobby/XmppClient.cpp

@@ -1110,7 +1110,8 @@ void XmppClient::handleMUCParticipantPresence(gloox::MUCRoom*, const gloox::MUCR
 				std::time(nullptr),
 				"nick", nick,
 				"oldrole", it->second.m_Role,
-				"newrole", participant.role);
+				"newrole", participant.role,
+				"reason", participant.reason);
 		}
 		else
 		{