Merge branch 'master' into jgrpp-beta

# Conflicts:
#	.github/workflows/ci-build.yml
#	src/lang/german.txt
#	src/lang/romanian.txt
#	src/lang/slovak.txt
#	src/lang/turkish.txt
#	src/network/core/address.cpp
#	src/network/core/tcp.h
#	src/network/core/udp.cpp
#	src/network/network.cpp
#	src/network/network_client.cpp
#	src/network/network_server.cpp
#	src/network/network_server.h
#	src/network/network_udp.cpp
#	src/openttd.cpp
#	src/saveload/newgrf_sl.cpp
#	src/tree_cmd.cpp
#	src/video/video_driver.hpp
#	src/window.cpp
#	src/window_gui.h

src/network/network_command.cpp

@@ -367,7 +367,7 @@ void NetworkGameSocketHandler::SendCommand(Packet *p, const CommandPacket *cp)
 	}
 
 	if (callback == lengthof(_callback_table)) {
-		DEBUG(net, 0, "Unknown callback. (Pointer: %p) No callback sent", cp->callback);
+		DEBUG(net, 0, "Unknown callback for command; no callback sent (command: %d)", cp->cmd);
 		callback = 0; // _callback_table[0] == nullptr
 	}
 	p->Send_uint8 (callback);